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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
choose the best answer:
1. "when did you go to work?"-"As soon as they came in, we ... to work"
A. went B. were going C. had gone D. go
2. Hardly... when the rain...
A. we had started/came B. we started/came C. did we started/ came D. had we started/ came
3. He... you now, but he won't believe you tomorrow.
A. believes B. is believing C. has believed D. believe
4. It... every day so far this week.
A. has rained B. rains C. has been raining D. rained
5. "Who's that man over there?" - "I... recognize his face, but... remember his name."
A. can't/ didn't B. could/ didn't C. did/ can't D. can/ don't
6. So far they... many beautiful buildings in this area.
A. had built B. have been building C. have built D. will build
7. "You look very tired" - "I..."
A. am marking B. had marked C. had been marking D. have been marking
8. Every morning since last Christmas, I... my dog out for a walk in the park.
A. take B. took C. have taken D. have been taking
9. "Did he answer the letter?" - "As soon as he... it, he... down to answer it"
A. reads/ sits B. has read/ is sitting C. read/ sat D. had read/ sat
10. Sue... this trip the other day.
A. loves B. is loving C. loved D. was loving
11. The blind... unable to see anything.
A. is B. are C. were D. was
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
I. Tense
- I’d like to borrow this book . _________ it yet ?
a. Did you read b. Had you read c. Have you read d. Do you read
2. We ____ in this town for a long time. We ______ here sixteen years ago.
a. had been / come b. have been / came c. were / came d. are / came
3. No breakfast for Mark, thanks . He _____ breakfast.
a. hasn’t eaten b. didn’t eat c. isn’t eating d. doesn’t eat
4. The news came as no surprise to me. I ____ for sometime that the factory was likely to close.
a. knew b. had known c. have known d. know.
5. Glenda _____ extremely hard when she was a student.
a. worked b. has worked c. was working d. had been worked
6. The world war II ___ in 1939 and _____ in 1945.
a. begins / ends b. had begun/ended c. has begun / had ended d. began / ended
7. I’ll see him when he ____ here tomorrow .
a. comes b. will come c. has come d. had come
8. I ____ at the check out when I _____ a strange looking man .
a. waited / noticed b. was waiting / noticed c. waited / was noticing d. was waiting / had noticed
9. Harry works all the time . He _____
a. never relaxes b. relaxes never c. often relaxes d. relaxes sometimes
10. The house was very quiet when I got home. Everybody ____ to bed
a. have gone b. went c. had gone d. goes
II; Choose the best answer :
1. It…………………quite often in Britain during the winter.
A. is snowing B. snows C. snowed D. was snowing
2. Every twelve months, the Earth………………the Sun.
A. circles B. circled C. has circled D. is circling
3. Right now, Jim……………..the newspaper and Kathy……………dinner. Last night at this time, they………….the same thing.
A. is reading / is making / were doing B. reads / makes / had doneC. has read / has made / are doing D. will read / will make / did
4. My father usually………………beer after meals but now he…………………tea.
A. drank / was drinking B. drinks / is drinking C. drinks / drinks D. has drunk / drinks
5. Wars………….the most terrible. At the moment, wars……………….in some places in the world.
A. are / happened B. have been / have been happening C. were / are happening D. are / are happening
6. Since his bicycle……………..stolen last week, he………………to school by bus.
A. has been ghoes B. had been / was going C. was / has gone D. was / went
7. You can’t see Tom because he…………….
A. is working B. was working C. has been working D. had been working
8. I have never played table tennis before. This is the first time I ........................ to play.
A. try B. tried C. have tried D. am trying
9. Hurry up! Our train ................ at 7 o’clock. We have just a little minutes.
A. leaves B. is leaving C. will be leaving D. is going to leave
10. The child is still ill but he ......................... better gradually.
A. gets B. is getting C. has gotten D. got
11. Don’t bother her. She ...................... her violin lesson; she always ............. it in the morning.
A. takes / is taking B. takes / takes C. is taking / is taking D. is taking / takes
12. The existence of many stars in the sky ................... us to suspect that there may be life on another planet.A. lead B. leads C. led . have led
13. The population of the world ................... at a tremendous rate and .................. out of control.
A. has increased / are soon going to B. is increased / soon will be
C. is increasing / soon will be D. has been increasing / are soon
14. Medical researchers .......................... for ways to control, prevent and cure cancers.
A. look B. are looking C. have looked D. have been looking
15. I’ll come to see you before I .................. for the United States.
A. leave B. will leave C. have left D. am leaving
Exercise 1: MULTIPLE CHOICE
Choose the best answer :
1. My friend, Mary, arrived after I………………..for her about half an hour.
A. was waiting B. had been waiting C. have been waiting D. have waited
2. The accident………………when we were on the way to Vung Tau.
A. occur B. occuring C. occurred D. had occurred
3 . It was midnight. Outside it………………very hard.
A. rains B. is raining C. rained D. was raining
4. When he……………… at the station, his train already………………..
A. arrived / left B. arrived / had left C. had arrived / left D. arrives / leaves
5 . You……………….your new hat when I ………………….you yesterday.A. were wearing / had met B. wore / had met
C. wore / was meeting D. were wearing / met
6. As I………………the glass, it suddenly ………………..into two pieces.
A. cut / broke B. was cutting / broke
C. cut / was breaking D. was cutting / had broken
7. When I………….to the party, Sally and Doug………….., John……………….drinks.
A. was coming / had danced / made
B. had come / danced / made
C. came / were dancing / was making
D. have come / are dancing / is making
8 When I…………….there, dinner………………, so I had a drink first.
A. get / is preparing B. get / has been prepared
C. got / had been prepared D. got / was being prepared
9. He……………….for her for nearly one hour last night before she………………
A. was waiting / came B. had been waiting / came
C. has waited / comes D. waited / will come
10. Andrew………………..the test before so he……………………..it very easy.
A. did / had found B. had done / found C. was doing / found D. did / was finding
11. While her brother was in the army, Sarah .................... to him twice a week.
A. was writing B. wrote C. has written D. had written
12. When I last........... him, he........... in London
A. saw-has been living B. see-in living
C. saw- was living D. have seen- lived
13. I was sad when I sold my car. I ..................... it for a very long time.
A. am running B. were running
C. have been running D. had been running
14. By next month, Laura ...................... for the company for twenty years.
A. will be working B. will work
C. has been working D. will have been working
15. When I last saw John, he .......................... and was out of breath.
A. was running B. ran C. has run D. had been running
Exercise 2: MULTIPLE CHOICE
1. Mary ______ in London for 15 years.
A. is living B. was living C. has lived D. lives
2. Tim ______ in three movies already. I think he’ll be a star some day.
A. has appeared B. was appearing C. had appeared D. is appearing
3: Ann lives in London. She ______ there for ten years.
A. is living B. had been living C. was living D. has been living
4: She hasn’t written to John ______ she left school.
A. since B. after C. when D. before
5. He ……………… to New York three times this year.
A. had been B. was C. is D. has been
6. The last time I saw him was in June, 2004.
A. I saw him since June, 2004.
B. I have seen him since June, 2004.
C. I have not seen him since June, 2004.
D. I didn't see him since June, 2004.
7. _________ any letters from him lately?
A. Are you receiving B. Do you receive C. Have you received D. Had you received
8. We _____ for him for 10 minutes.
A. will have waited B. wait C. have been waiting D. waited
9. We _____ him for months now.
A. don't see B. haven't seen C. didn't see D. won't see
10. I haven't eaten this kind of food before.
A. I haven't eaten this kind of food already.
B. This is the first kind of food I have eaten.
C. This is the first time I've eaten this kind of food.
D. Even before I have not eaten this kind of food.
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. I _______this film twice.
A. see B. saw C. will see D. have seen
2. –Peter, please help me do the washing up. – Sorry, Mum. I ____TV.
A. watch B. am watching C. had watched D. watched
3. The farmers _____ in the field now.
A. were working B. have worked C. worked D. are working
4. The war _____ out three years ago.
A. broke B. had broken C. has broken D. was breaking
5. He ______ a cup of coffee every morning.
A. drinks B. drank C. is drinking D. has drunk
6. She ______ a lot of new books.
A. had just bought B. has just bought C. buys D. bought
7. Up to the present, Nam_____ good work in his class.
A. does B. has done C. had done D. did
8. At present, that author ______ a historical novel.
A. is writing B. was writing C. has written D. had written
9. By next month, I _____ my first novel.
A. will finish B. am going to finish C. finish D. will have finished
10. Phong ______ at the university so far.
A. had worked B. was working C. worked D. has worked
11. How long _____ able to drive? – since 1990.
A. could you B. have you been C. were you D. are you
12. They ______ since eight o’clock.
A. are talking B. have been talking C. talked D. talk
13. My brother _______ in the army from 1990 to 1995.
A. served B. has served C. had served D. is serving
14. At this moment, I _____ that we have a good chance of victory.
A. was feeling B. am feeling C. feel D. had been feeling
15. I _____ the money from him yet.
A. haven’t received B. don’t receive
C. will receive D. am receiving
16. This is the most interesting book _____ .
A. I’ve read B. I had read C. I’ve ever readed D. I’ve ever read
17. I ____ him ten days ago.
A. see B. saw C. have seen D. will see
18. It ______ a long time since I last saw him.
A. is B. was C. will be D. had been
19. She _____ so hard this week that she doesn’t have time to go to the hairdresser’s.
A. works B. worked C. has been working D. had worked
20. Mr. John_______ to Los Angeles in 1992.
A. had gone B. has gone C. went D. was going
21. What ______ to you yesterday?
A. happened B. did happen C. had happened D. has happened
22. I never go to Australia. I _____ to Australia yet.
A. will go B. went C. haven’t been D. have been
23. What _____ do at 7:00 tomorrow morning.
A. will you B. shall you C. were you D. did you
24. Why ______ you come yesterday?
A. couldn’t B. can’t C. didn’t D. A and C
25. My mother ______ in this factory since 1990
A. works B. worked C. has worked D. had worked
26. I _____ my hair before breakfast this morning.
A. washed B. had washed C. was washing D. have washed
27. I _____ about him when he suddenly came in.
A. talk B. talked C. am talking D. was talking
28. He will finish this work before you _______ here tomorrow.
A. leave B. will leave C. would leave D. are going to leave
29. Don’t make noise. My mother ______ with her friends.
A. is talking B. was talking C. talks D. talked
30. He _____ in this office for ten years by next Monday.
A. will have been working
B. would be working C. will work D. will be working
31. No sooner _____ the office than the telephone rang.
A. was he leaving B. he was leaving C. he had left D. had he left
32. George______ this movie three times.
A. sees B. has seen C. saw D. had seen
33. Food, air and clothes _______ necessary for life.
A. was B. were C. is D. are
34. He ______ a visit to Halong Bay in 1995.
A. had paid B. paid C. has paid D. pays
35. This morning while I ______ for the bus, the rain stopped.
A. waited B. have waited C. had waited D. was waiting
36. What _____ during the last few weeks.
A. did you do B. had you been doing
C. have you been doing D. were you doing
37. Up to now, the teacher _______ our class five tests.
A. gives B. is giving C. has given D. had given
38. The students _____ English now.
A. study B. are studying C. will study D. have studied
39. I don’t feel good. I _____ work tomorrow.
A. won’t be going B. won’t go to C. don’t go D. went
40. He is tired because he ____ all day.
A. had worked B. has worked C. worked D. works
41. _____ at home tonight?
A. are you staying B. do you stay
C. were you staying D. did you stay
42. We _____ in this house for ten years.
A. are living B. were living C. had lived D. have lived
43. She ____ in the departure lounge for a long time.
A. is waiting B. was waiting C. waits D. has waited
44. I ______ my driving test on Friday.
A. have passed B. had passed C. passed D. was passing
45. I ______ a vegetarian since 1998.
A. am B. was C. have been D. had been
7. I _______the garage, but I couldn't find the brush to do that.
'A. am painting
B. painted
C. was going to paint
D. have painted
8. Don't ring my cell phone at 2 p.m. I _______ the questons in the "Call me later."
A. am going to answer
B. will be answering
C. will have answered
D. have answered
9.When his bomb dismissed him from his job, he _______ there for ten years.
A. was working
B. worked
C. had been working
D. has been working
10.Rick _______ badly, so the coach decided to leave him out of my team. He was very sorry.
A. isn't playing
B. plays
C. had been playing
D. has played
11. He can't remember any of the bad habits he ________ when he was younger.
A. had
B. has had
C. were having
D. had had
12. A man _______ me to work three times this week, so I _______ him to the police.
A. follows - am reporting
B. has followed - have reported
C. is following - reported
D. followed- report
13 The weight of the melons _______ .
A. might have varied
B. were varied
C. vary
D. varies
7. I _______the garage, but I couldn't find the brush to do that.
'A. am painting
B. painted
C. was going to paint
D. have painted
8. Don't ring my cell phone at 2 p.m. I _______ the questons in the "Call me later."
A. am going to answer
B. will be answering
C. will have answered
D. have answered
9.When his bomb dismissed him from his job, he _______ there for ten years.
A. was working
B. worked
C. had been working
D. has been working
10.Rick _______ badly, so the coach decided to leave him out of my team. He was very sorry.
A. isn't playing
B. plays
C. had been playing
D. has played
11. He can't remember any of the bad habits he ________ when he was younger.
A. had
B. has had
C. were having
D. had had
12. A man _______ me to work three times this week, so I _______ him to the police.
A. follows - am reporting
B. has followed - have reported
C. is following - reported
D. followed- report
13 The weight of the melons _______ .
A. might have varied
B. were varied
C. vary
D. varies