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Exercise 6 : Choose the best answer for each of the following sentences. 1._____have enough apples, she’ll make an apple pie this afternoon. A.Should she B. If she C. Will she D. Unless she 2.If you_____to me, you wouldn’t have got so much trouble. A. listened B. would listen C. had listened D. Would have listened 3.If you don’t know how to spell a word, you_____ look it up in the dictionary. A. must B. will C. should D. ought 4.If the sun _____, we _____for a walk. A. shines / will go B. shone / will go C. shone / would go D. had shone / would go 5.The campfire _____ if it _____ last night. A. wouldn’t be cancelled / hadn’t rained B. wouldn’t have been cancelled / hadn’t rained C. would have been cancelled / hadn’t rained D. will be cancelled / rains 6.But for our parents, we _____ successful in life. A. will never be B. would never be C. wouldn’t have be D. would have never been 7.If I _____ my wallet at home this morning, I _____ money for lunch now. A. leave / will have B. didn’t leave / would have C. hadn’t left / would have D. hadn’t left / would have had 8.It is too bad, Lam isn’t here. If he _____ here, he _____ what to do. A. were / would know B. is / will know C. had been / would have known D. was / would know 9.If we _____ the plans carefully, we would not have had so many serious mistakes. A. study B. had studied C. studied D. were studying 10.I will never talk to you again _____ you apologize me _____ your being rude. A. if / for B. unless / for C. or / of D. whether / or 11._____if you work harder, you will be sacked. A. Whether B. If C. However D. Unless 12.I think you should stop smoking. A. If I am you, I will stop smoking. B. If I were you, I will stop smoking. C. If I were you, I would stop smoking. D. If I had been you, I would stop smoking. 13.If you take the ice out of the fridge, it _____. A. vaporizes B. melts C. heats D. disappears 14.We should do something to protect water from being polluted _____we will have nothing to drink in the future. A. if B. whether C. or D. unless 15.Let’s knock on their door to see _____home. A. if they’re B. unless they’re C. whether they were D. if they were 16.Unless we _____more snow, we can’t go skiing. A. will have B. have C. have had D. had 17.You’ll fail the exam _____ you start revising. A. if B. until C. when D. unless 18.Unless you wash the car, you _____not drive it at the weekend. A. would B. could C. have to D. may 19.If Peter _____his car before the drive, he _____the problem of out of petrol. A. checked / will not get B. had checked / would not have got C. checks / will not have got D. would be checking / will not have got 20.He stepped on the mine, and it exploded. A.If he doesn’t step on the mine, it doesn’t explode. B.If he doesn’t step on the mine, it won’t explode. C.If he didn’t step on the mine, it wouldn’t explode. D.If he hadn’t stepped on the mine, it wouldn’t have exploded. 21. In my experiments, the liquid is cooled to 32ºF. It always freezes. A.If you cool the liquid to 32 degrees, it froze. B.If you cooled the liquid to 32 degrees, it would freeze. C.If you cool the liquid to 32 degrees, it will freeze. D.If you had cooled the liquid to 32 degrees, it would have frozen. 22.It may rain this afternoon. I hope it doesn’t because I don’t want the match to be cancelled. A. If it rains, the match is cancelled. B. If it rains, the match will be cancelled. C. if it rained, the match would be cancelled D. If it had rained, the match would have been cancelled. 23.Unfortunately, I don’t know Philosophy, so I can’t answer your question. A.If I know Philosophy, I can answer your question. B.If I know Philosophy, I will be able to answer your question. C.If I knew Philosophy, I would be able to answer your question. D.If I had known Philosophy, I would have been able to answer your question. 24._____ there are some more ideas, we can end the meeting now. A. If B. As if C. Unless D. In case 25.If he _____with us now, he _____ the beauty of nature of the National Park. A. is / can enjoy B. was / will enjoy C. has been / would enjoy D. were / could enjoy 26.If they had searched more carefully, they...the watch sooner. A. will find B. would find C. found D. would have found 27.If I had got up early, I _____ to have breakfast now. A. have B.I had C. would have D. would have had 28.I cannot buy a new computer _____ I save enough money. A. if B. even if C. unless D. as if 29.Most people you meet will be polite to you _____. A. if you are polite to them B. if you will be polite to them C. unless you are polite to them D. if you were polite to them 30.If you do so, it _____ the matter worse. A. makes only B. would only make C. will only make D. had only made 31.You _____ English fluently unless you practice it every day. A. will speak B. will not speak C. can speak D. did not speak 32.Hurry up _____ you will miss the bus and be late for school. A. if B. and C. or D. as 33.You will get a good seat if you _____ first. A. come B. came C. have come D. will come 34.Sam will not graduate_____. A. if he passed all the tests B. if he does not pass all the tests. C. unless he passes all the tests D. unless he had passed all the tests. 35.If I had time, I would go with you. A.I am free and surely go with you. B.I am too busy to go with you. C. I will go with you because I have time. D. I am free enough to go with you. 36.If Margaret hadn’t been wearing a seat belt, she.... Injured. A. has been B. would has been C. would be D. would have been 37.If I _____ the rain yesterday, I_____ ill. A. had not caught / would have been B. had not caught / would have not been C. have not caught / were not D. have not caught / would have been 38.He looked frightened as if he _____ a ghost. A. sees B. is seeing C. has seen D. had seen 39.What _____if there _____ a serious nuclear accident. A. will happen / was B. happens / were C. would happen / were D. would happen / had been
Lần sau bn vt thì cách ra cho dễ nhìn nhé~~~~
Choose the best answer for each of the following sentences. 1._____have enough apples, she’ll make an apple pie this afternoon. A.Should she B. If she C. Will she D. Unless she
2.If you_____to me, you wouldn’t have got so much trouble.
A. listened B. would listen C. had listened D. Would have listened
3.If you don’t know how to spell a word, you_____ look it up in the dictionary.
A. must B. will C. should D. ought
4.If the sun _____, we _____for a walk.
A. shines / will go B. shone / will go C. shone / would go D. had shone / would go
5.The campfire _____ if it _____ last night.
A. wouldn’t be cancelled / hadn’t rained B. wouldn’t have been cancelled / hadn’t rained C. would have been cancelled / hadn’t rained D. will be cancelled / rains
6.But for our parents, we _____ successful in life.
A. will never be B. would never be C. wouldn’t have be D. would have never been
7.If I _____ my wallet at home this morning, I _____ money for lunch now.
A. leave / will have B. didn’t leave / would have C. hadn’t left / would have D. hadn’t left / would have had
8.It is too bad, Lam isn’t here. If he _____ here, he _____ what to do.
A. were / would know B. is / will know C. had been / would have known D. was / would know
9.If we _____ the plans carefully, we would not have had so many serious mistakes.
A. study B. had studied C. studied D. were studying
10.I will never talk to you again _____ you apologize me _____ your being rude.
A. if / for B. unless / for C. or / of D. whether / or
Exercise 1
1. The wedding party________ held at the Rex Hotel.
A. is B. is being C. will be D. is going to be
2. How many languages_____ John speak?
A. do B. does C. did D. will
3. Hurry! The train________ I don't want to miss it.
A. comes B. is coming C. came D. has come
4. Angelina Jolie is a famous actress. She ________ in several films.
A. appears B. is appearing C. appeared D. has appeared
5. I saw Maggie at the party. She ________ in several film.
A. wears B. wore C. was wearing D. has worn
6. What time________ the next train leave?
A. does B. will C. shall D. would
7. Monica________ with her sister at the moment until she finds a flat.
A. stays B. is staying C. will stay D. is going to stay
8. After I________ lunch, I looked for my bag.
A. had B. had had C. have has D. have had
9. By the end of next year, George________ English for 2 years.
A. will have learned B. will learn C. has leaned D. would learn
10. The man got out of the car,_______ round to the back and opened the boot.
A. walking B. walked C. walks D. walk
11. For several years his ambition ________ to be a pilot.
A. is B. has been C. was D. had been
12. Henry________ into the restaurant when the writer was having dinner.
A. was going B. went C. has gone D. did go
13. He will take the dog out for a walk as soon as he ________ dinner.
A. finish B. finishes C. will finish D. shall have finished
14. Before you asked, the letter________
A. was written B. had been written C. had written D. has been written
15. She ________ English at RMIT these days.
A. studies B. is studying C. will study D. is gong to study
16. She's at her best when she________ big decisions.
A. is making B. makes C. had made D. will make
17. We________ next vacation in London.
A. spend B. are spending C. will spend D. are going to spend
18. Robert________ tomorrow morning on the 10:30 train.
A. arrived B. is arriving C. has arrived D. would arrive
19. Look! The bus________
A. left B. has left C. leaves D. is leaving
20. Mike________ one hour ago.
A. phoned B. was phoning C. had phoned D. has phoned
Exercise 1
1. The wedding party________ held at the Rex Hotel.
A. is B. is being C. will be D. is going to be
2. How many languages_____ John speak?
A. do B. does C. did D. will
3. Hurry! The train________ I don't want to miss it.
A. comes B. is coming C. came D. has come
4. Angelina Jolie is a famous actress. She ________ in several film.
A. appears B. is appearing C. appeared D. has appeared
5. I saw Maggie at the party. She ________ in several film.
A. wears B. wore C. was wearing D. has worn
6. What time________ the next train leave?
A. does B. will C. shall D. would
7. Monica________ with her sister at the moment until she finds a flat.
A. stays B. is staying C. will stay D. is going to stay
8. After I________ lunch, I looked for my bag.
A. had B. had had C. have has D. have had
9. By the end of next year, George________ English for 2 years.
A. will have learned B. will learn C. has leaned D. would learn
10. The man got out of the car,_______ round to the back and opened the boot.
A. walking B. walked C. walks D. walk
11. For several years his ambition ________ to be a pilot.
A. is B. has been C. was D. had been
12. Henry________ into the restaurant when the writer was having dinner.
A. was going B. went C. has gone D. did go
13. He will take the dog out for a walk as soon as he ________ dinner.
A. finish B. finishes C. will finish D. shall have finished
14. Before you asked, the letter________
A. was written B. had been written C. had written D. has been written
15. She ________ English at RMIT these days.
A. studies B. is studying C. will study D. is gong to study
16. She's at her best when she________ big decisions.
A. is making B. makes C. had made D. will make
17. We________ next vacation in London.
A. spend B. are spending C. will spend D. are going to spend
18. Robert________ tomorrow morning on the 10:30 train.
A. arrived B. is arriving C. has arrived D. would arrive
19. Look! The bus________
A. left B. has left C. leaves D. is leaving
20. Mike________ one hour ago.
A. phoned B. was phoning C. had phoned D. has phoned
3. The secrtary ___ the report by 10:00 yesterday
a.hasn't finished b.hadn't finished c. didn't finished d. would finish
4. Jane's eyes are red. She __
a.cried b. has cried c. has been crying d. had cried
5. This room is dirty. Someone _____ in here
a. smoked b. has smoked c. had been smoking d. has been smoking
6. Arsenal _____ next Monday
a, wins b. will win c.would win d. is winning
7. It _____ rain tomorow
a. rains b. will rain c. is going to rain d. is raining
8. I'll come and see you before I _____ for America
a. leave b. will leave c. have left d. shall leave
9. The little girl asked what ____ to her fiend.
a. has happened b.happend c. had happend d. would have been happend
10. John ____ a book when i saw him
a. is reading b. read c. was reading d. reading
11. He said he ___return
a. will b. would c. can d.would be
12. Jack _____ he door
a. has just opened b. open c. will have opened d.opening
13.I have been waiting for you ____
a. since early morning b. since 9a.m c.for two hours d.all the correct
14. My sister __ for you since yessterday
a. is looking b. was looking c. has been looking d. looked
15.Jack )____ the door.
a. has just painted b.paint c. will have paited d. painting
16. The train ____ half an hour ago
a. has been leaving b. left c. has left d. had left
17. we __ Doris since last Sunday
a. don't see b. haven't seen c. didn't see d. hadn't seen
18.when i last saw him, he ___ in London
a. has lived b. is living c. was living d. had been living
19. she is tired now. She ___ for a long time
a. has been learning b.has learned c. learns d.learned
20.they will have gone home before you _____ to meet them
a. came b. come c.will come d. are coming
EX 2:
1. hurry up or the train __ before you catch it
a. will leave b. leaves c. will have left d.has left
2. now my sister ____a bicycle of her own
a. is having b. are having c. has d. had
3.A football team ___ chieflyof 12 players
a. composed b. composes c.comprised d. comprises
4. This is the first time I ___ here
a. am b.have been c.was d.be
5last week , my professor promised that he _____ today
a. would come b. will come c. comes d.coming
6. My girls friend arrived after I ____ for her about half an hour
a,was waiting b.had been waiting c.has been waiting d. have waited
7.did she say the _____ him tomorrow ?
a.has visited b. will visit c. would visit d. iss
8. ________ to rain before you woke up this morning ?
a. did it begin b. has never begun c.had it begun d. would it begun
9.my daughter saw an elephent this morning but she _ one before
a. had never seen b. has never seen c.never seen d. never had seen
10. I ___ in Da Nang before i moved to dong nai
a. have been living b. have lived c. had lived d. had been living
11. there are many ways ____ to Rome
a. is leading b. are leading c. leading d.led
12.when we got home, dinner ____ so we had a drink first
a. was preparing b. was being prepard c. was prepared d. had been prepared
13. she was tired. she ___ for a long time
a. has been learning b. had been learning c. learned d. was learning
14. he __ in space for 10 days by tomorrow
a. will travel b. will be travelling c. is not visiting d. does not visit
15. he said he would visit me, but he ___ me yet
a. has not visited b. had not visited c. is not visiting d. does not visit
16. The weather ___ fine so far this week
a. is b. has been c. was d. had been
17 Before the prime Minister leaves New Your he ___ several talks
a. will have had b. would have c. will be having d. has
18. we had just got out of car when it ___ to set fire
a. has begun b. had begun c. was beginning d. has
19.As soon as he __ a certificate in English, he will apply for a jop
a. would get b.got c. gets d.will get
20.he was told that he _ knocked out in the first round
a. had been b.was c. has been d. was being
1. After Jessica…………. her degree, she intends to work in her father’s factory.
A. will finish B. will have finished C. finishes D. is finishing
2. By the time I go to bed tonight, I ……my work for the day.
A. will finish B. have finished C. will have finished D. finish
3. When my parents….for a visit tomorrow, they will see our new baby for the first time.
A. will arrive B. arrived C. will have arrived D. arrive
4. Fatemah looked down to discover a snake at her feet. When she saw it, she………….
A. was screaming B. had screamed C. screamed D. screams
5. By the time Alfonso finally graduated from high school, he………….seven different schools
because his parents moved frequently.
A. attended B. was attending C. had attended D. had been attended
6. Until you learn to relax more, you……….your ability to speak English.
A. haven’t improved B. aren’t improving C. don’t improve D. won’t improve
7. I borrowed four books on gardening the last time………………to the library.
A. go B. went C. had gone D. have gone
8. Before I stared the car, all of the passengers………………..their seat belts.
A. will buckle B. had buckled C. buckle D. have buckled
9. It seems that whether I traveled abroad I ……….to take something I need.
A. forgot B. am forgetting C. forget D. had forgotten
10. When I see the doctor this afternoon, I …...him to look at my throat.
A. will ask B. asked C. will have asked D. ask
Chọn đáp án đúng
1. According to estimates, there ____ no energy shortage after these large dams ____
A. will be - have been constructed B. is - will be constructed
C. should be- had been constructed D. was- would be constructed
2. " Can we use the court now? " " Not yet. But as everything is ready, we can start as soon as they_____ "
A. finished B. will finish
C. have finished D. will have finished
3. I'm sure he ____ you the moment he ____ any news about the case
A. has called - got B. called - is getting
C. is calling - will get D. will call - gets
4. We_____ for a cottage to rent while we____ our relatives in the USA next summer
A. have looked- were visiting B. have been looking - visited
C. were looking- had visited D. will look - are visiting
5. During the winter months, many people make plans about what they ___ once winter ____
A. are doing - will arrive B. do- will have finished
C. will do- has arrived D. have done- arrives
6. ____ get older, the games they play become increasingly complex
A. Children B. Children, when they
C. As children D. For children to
Chon dap an dung : ( BT ve thi )
1. ________ a car when they were living in London?
a. Have they b. Did they have c. Were they having d. have they had
2. They ________ serving meals by the time we get to the restaurant.
a. will stop b. stopped c. are stopping d. will have stopped
3. Mark was listening to music while his sister_______ a book.
a. read. b. reads c. is reading d. was reading
4. You______ here for my party, won't you?
a. shall be b. won't be c. will be d. are going to be
5. Can I borrow your bike on Monday? I'm sorry, but_____ it.
a. I'll be using b. used c. use d. have used
6. We______ the concert. It was really good.
a. are enjoying b. enjoy c. did enjoy d. would enjoy
7. It was 10 p.m. Most of the shops_____ just______
a. have/closed b. had/closed c. has/closed d. was closing
8. There's no more apples. We ______ them all.
a. had eaten b. ate c. eat d. have eaten
9. She_______ music all day. Now she fells tired.
a. has been playing b. is playing c. played d. plays
10. After he________ the house, he wrote a letter.
a. cleans b. was cleaning c. had cleaned d. has cleaned
11. They_____ me about it last week.
a. was telling b. told c. had told d. would tell
12. I_______ here at the end of the month.
a. will leave b. would leave c. would have left d. is leaving
13. I hope everything______ fine.
a. is b. was c. would be d. will be
14. My grandfather______ many years ago.
a. had died b. has died c. died d. was dying
15. I______________ my son the money for that last week.
a. gave b. given c. have given d. was given
16. Yesterday I passed by Peter's house, but the front door was closed. He__out.
a. went b. must have gone c. has gone d. had had
17. Where ________ you at 9:00 last night, Mr. Green?
a. have been b. were c. will be d. are
18. I ________ the dishwasher on when heard the shot.
a. am turning b. turned c. was turning d. turned
19. Now I _______ for what I said about you. It wasn't true and I shouldn't
have said it
a. do apologize b. apologized c. was apologized d. apologizing
20. Tim was tired. He ______ hard all day.
a. has been studying b. studies c. studied d. had been studying
1. C. usually plays
2. A. burnt
3. C. has been
4. C. haven’t had
5. B. will
6. B. has left
7.C. has made
8. B. Have you seen
9. C. played
10. A. has played
11. C. am working
12. C. was sleeping
13. B. has been
14. D. have driven
15. B. are going to
16. D. I’ve been
17. D. do you get
18. C. saw
19. D. since
20. B. for
21. B. telephoned
22. C. feels
23. D. have returned
24. A. had been won
25. D. discovered
26. B. depends
27. C. I’m working
28. B. we’ll be flying
29. B. are going to
30. B. was dancing
31. A. had done
32. B. have you been
33. A. is
34. B. didn’t it
35. C. were they
36. D. shall we
37. D. finished
38 . B. got
39. B. finished
40. C. since
41. B. lived
42. .A. is having
43 .A. am working
44 .D. had you been/ had left
45. A. I was watching TV
46. D. is being repaired
47. B. was walking
48. A. doesn’t usually go
49. D. usually cleans
50. D. has been improved
Chúc bạn học tốt!
1. John ............................... tennis once or twice a week.
A. is playing usually B. is usually playing
C. usually plays D. plays usually
2. Tom ......................... his hand when he was cooking dinner.
A. burnt B. was burning C. has burnt D. had burnt
3. Jim is away on holiday. He ........................ to Spain.
A. is gone B. have been C. has been D. was
4. Everything is going well. We ....................... any problems so far.
A. didn’t have B. don’t have C. haven’t had D. hadn’t had
5. I think the weather ............................ be nice later.
A. shall B. will C. is going to D. can
6. Jane .................................... just a few minutes ago.
A. left B. has left C. leaves D. had left
7. Timson ...................... 13 films and I think her latest is the best.
A. made B. had made C. has made D. was making
8. ................................. Robert lately ?
A. Did you see B. Have you seen C. Do you see D. Are you seeing
9. When I was a child, I ............................... the violin.
A. was playing B. am playing C. played D. play
10. He ......................... for the national team in 65 matches so far.
A. has played B. has been played C. played D. is playing
11. I’m busy at the moment. I .................................. on the computer.
A. work B. worke C. am working D. working
12. When I looked round the door, the baby ............................. quietly.
A. is sleeping B. slept C. was sleeping D. were sleeping
13. Robert ....................... ill for three weeks. He is still in hospital.
A. had been B. has been C. is D. was
14. I’m very tired. I ..................... over four hundred miles today.
A. drive B. am driving C. have drived D. have driven
15. Our friends ............................... meet us at the airport tonight.
A. are B. are going to C. go to D. will be to
16. This isn’t my first time to visit London ........................... here before.
A. I’m B. I’d been C. I was D. I’ve been
17. What time ............................. to work this morning ?
A. did you get B. are you getting C. have you got D. do you get
18. When I ..................... him, the man was running away.
A. see B. was seeing C. saw D. had seen
19. I haven’t seen Kate ............................. Christmas.
A. for B. never C. ever D. since
20. He’s worked for this company ......................... many years.
A. since B. for C. in D. at
21.As soon as Martina saw the fire, she _______ the fire department
A. was telephoning B. telephoned
C. had telephoned D. has telephoned
22.Every time Parkas sees a movie made in India, he _______homesick
A. will have left B. felt C. feels D. is feeling
23.Since I left Venezuela six years ago, I _______to visit friends and family several times
A. return B. will have returned
C. am returning D. have returned
24.After the race _______, the celebration began
A. had been won B. is won C. will be won D. has been won
25.While he was washing his car, Mr. Brown _______a small dint in the rear fender.
A. has discovered B. was discovering C. is discovering D. discovered
26.The earth _______ on the sun for its heat and light
A. is depended B. depends C. is depending D. has depended
27.I’m busy at the moment _______on the computer
A. I work B. I’m worked C. I’m working D. I worked
28.At this time tomorrow _______over the Atlantic
A. we’re flying B. we’ll be flying C. we’ll fly D. we’re to fly
29. Our friends _______next us at the airport tonight
A. are B. are going to C. go to D. will be to
30. When I entered the room, everyone _____________.
A. has been dancing B. was dancing C. had danced D. danced
31. He said that he _________ his homework since 7 o’clock.
A. had done B. did C. has done D. was doing
32. How long __________ able to drive? - Since 1990.
A. could you B. have you been C. were you D. are you
33. She won't get married until she __________ 25 years old.
A. is B. will be C. had been D. was.
34.This building used to be a library,_________?
A. doesn't it B. didn’t it C. isn’t it D. wasn’t it
35. Nobody was injured in the accident, ________?
A. was there B. was he C. were they D. wasn't it
36. Let's go out for a walk, ______?
A. not us B. don't we C. do we D. shall we
37. Jane and I________ school in 1987.
A. finish B. have finished C. finishes D. finished
38 . John and Ann ………. married last Saturday.
A. get B. got C. is getting D. have got
39. His brother…………….high school 6 years ago
A. finish B. finished C. finishes D. has finished
40. We have been living here………...1990
A. for B. from C. since D. during
41. Pasteur _____ in the 19th century.
A. was living B. lived C. had lived D. has lived
42. .Now my sister _____ a bicycle of her own.
A. is having B. are having C. has D. had
43 .Don’t bother me while I ………………..
A. am working B. was working
C. will work D. will have completed
44 .How ................since we ................school?
A. are you / left B. will you be / had left
C. have you been / left D. had you been/ had left
45.When he came..........................
A. I was watching TV B. I watched TV
C. I am watching TV D. I have watched TV
46. The piano _____ at the moment.
A. repairs B. repaired C. is repaired D. is being repaired
47. I saw Jack yesterday morning while I ________ home from work.
A. walked B. was walking C. am walking D. had been walking
48. My brother................out at weekend.
A. doesn’t usually go B. does usually not go
C. doesn’t usually goes D. usually doesn’t goes.
49. Every day, my sister .................the floor.
A. usually clean B. cleans usually C. usually cleaned D. usually cleans
50. Your English …………wonderfully since last month.
A. improved B. was improved
C. have improved D. has been improved
11. It's high time you... ...to look after yourself. A) learn B) learned C) will learn D) would learn
12. After her husband's accident, she...... .the sole breadwinner of the family. A) had become B) would became C) became D) used to be
13. Let me know as soon as Linda......... here. A) got B) will get C) would get D)gets
14. After Mary... . her degree, she intends to work in her father's company. A)will finish B) is finishing C) finishes D) will have finished
15. A small stone struck the windshield while we.....down the gravel road. A)drive B) were driving C) had driven D) had been driving
16. The science classes at this .... ...difficult. A)school are B) schools are C) school is D) school's is
17. The English... . strong traditions. A)have much B) has much C) has many D) have many
18. Peter painted the room black. It looks dark and dreary. He... . chosen a different colour. A) had to B) must have C) should have D) could have been
19. It is imperative.. A)that you shall arrive B) that you must arrive here in time here in time C) that you arrive here D) that you had to arrive in time here in time
20. The classroom is empty. I think they.. .to the laboratory. A) must have gone B)should have gone C) need have gone D) can have gone