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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
Choose the best answer from the four options given (A, B,C, or D) to complete each sentence.
6. Lan wishes she_________a long vacation.
A. has B. had C. have D. having
7. He saw that film_________7.00 p.m_________Sunday.
A. on-from B. in-at C. at-at D. at-on
8. You like watching sports, _________, Peter?
A. do you B. aren’t you C. don’t you D. doesn’t he
9. You shouldn’t eat_________. It’s not good for your health.
A. quick B. quickly C. fastly D. slow
10. Minh got wet_________he forgot his umbrella.
A. so B. because C. and D. therefore
11. The girl_________is standing near the window is my sister.
A. who B. when C. where D. in which
12. We_________Nam since he left school.
A. met B. meet C. meeting D. haven’t met
13. Do you mind_________me home?
A. taking B. take C. took D. to take
14. This building_________in 1980.
A. built B. builds C. was built D. is built
15. She asked me_________ at English.
A. if I was good B. if was I good C. if I good D. if I am good
16. If you_________your passport, you will be in trouble.
A. lost B. lose C. would lose D. losing
17. What’s the name of the man_________gave us a gift?
A. he B. which C. who D. whose
18. The librarian asked us_________so much noise.
A. not to make B. no make C. not making D. don’t make
19. We have lived in this flat_________five years.
A. ago B. for C. since D. already
20. I really enjoyed the disco. It was great, _________?
A. isn’t it B. is it C. wasn’t it D. weren’t it
Choose the best answer from the four options given (A, B,C, or D) to complete each sentence.
6. Lan wishes she_________a long vacation.
A. has B. had C. have D. having
7. He saw that film_________7.00 p.m_________Sunday.
A. on-from B. in-at C. at-at D. at-on
8. You like watching sports, _________, Peter?
A. do you B. aren’t you C. don’t you D. doesn’t he
9. You shouldn’t eat_________. It’s not good for your health.
A. quick B. quickly C. fastly D. slow
10. Minh got wet_________he forgot his umbrella.
A. so B. because C. and D. therefore
11. The girl_________is standing near the window is my sister.
A. who B. when C. where D. in which
12. We_________Nam since he left school.
A. met B. meet C. meeting D. haven’t met
13. Do you mind_________me home?
A. taking B. take C. took D. to take
14. This building_________in 1980.
A. built B. builds C. was built D. is built
15. She asked me_________ at English.
A. if I was good B. if was I good C. if I good D. if I am good
16. If you_________your passport, you will be in trouble.
A. lost B. lose C. would lose D. losing
17. What’s the name of the man_________gave us a gift?
A. he B. which C. who D. whose
18. The librarian asked us_________so much noise.
A. not to make B. no make C. not making D. don’t make
19. We have lived in this flat_________five years.
A. ago B. for C. since D. already
20. I really enjoyed the disco. It was great, _________?
A. isn’t it B. is it C. wasn’t it D. weren’t it
Bài 3: Chọn đáp án đúng.
1. I would have visited you before if there _____ quite a lot of people in your house.
A. hadn't B. hadn't been C. wouldn't be D. wasn't
2. If you had caught the bus, you _____ late for work.
A. wouldn't have been B. would have been
C. wouldn’t be D. would be
3. If I _____, I would express my feelings.
A. were asked B. would ask
C. had been asked D. asked
4. If _____ as I told her, she would have succeeded.
A. she has done B. she had done
C. she does D. she did
5. Will you be angry if I _____ your pocket dictionary?
A. stole B. have stolen C. were to steal D. steal
6. You made a mistake by telling her a lie. It _____ better if you _____ to her.
A. would have been / hadn't lied B. would be / didn't lie
C. will be / don't lie D. would be / hadn't lied
7. John would be taking a great risk if he _____ his money in that business.
A. would invest B. invested C. had invested D. invests
8. She wouldn't have given them all that money if we _____ her to.
A. wouldn’t advise B. won't advise
C. hadn't advised D. didn't advise
9. If the tree hadn't been so high, he _____ it up to take his kite down.
A. could have climbed B. climb
C. is climbing D. climbed
10. If the wall weren't so high, he _____ it up to take his ball down.
A. climbed B. could climb C. is climbing D. climb
11. If I _____ her phone number, I _____ her last night
A. had known / could have phoned B. knew / would have phoned
C. know / can phone D. knew / could phone
12. If he ______ the truth, the police wouldn’t arrest him.
A. tells B. told C. had told D. would tell
13. If you press that button what _____?
A. would happen B. would have happened
C. will happen D. happen
14. She says if she _____ that the traffic lights were red she _____.
A. had realized / would stop B. realized / could have stopped
C. has realized / stopped D. had realized / would have stopped
15. I am very thin. I think, if I _____ smoking, I might get fat.
A. stop B. had stopped C. will stop D. stopped
16. If I _____ that yesterday, I _____ them.
A. had discovered / would inform
B. had discovered / would have informed
C. had discovered / could inform
D. discovered / can inform
17. If you _______ to the course regularly, they ________ a certificate last year.
A. go / gave B. go / give
C. had gone / would have given D. went / would give
18. I think he is not at home. If he _____ in, he ______ the phone.
A. was / answered B. were / would answer
C. were / would have answered D.had been / would have answered
19. If I ______ in London now, I could visit British Museum.
A. were B. had been C. have been D. would be
20. If Columbus _______ money from Queen Isabella, he _______ across the Atlantic.
A. do not receive / could not sail
B. had not received / might not have sailed
C. did not receive / might not have sailed
D. would not receive / might not sail
1. I would have visited you before if there _____ quite a lot of people in your house.
A. hadn't B. hadn't been C. wouldn't be D. wasn't
2. If you had caught the bus, you _____ late for work.
A. wouldn't have been B. would have been
C. wouldn’t be D. would be
3. If I _____, I would express my feelings.
A. were asked B. would ask
C. had been asked D. asked
4. If _____ as I told her, she would have succeeded.
A. she has done B. she had done
C. she does D. she did
5. Will you be angry if I _____ your pocket dictionary?
A. stole B. have stolen C. were to steal D. steal
6. You made a mistake by telling her a lie. It _____ better if you _____ to her.
A. would have been / hadn't lied B. would be / didn't lie
C. will be / don't lie D. would be / hadn't lied
7. John would be taking a great risk if he _____ his money in that business.
A. would invest B. invested C. had invested D. invests
8. She wouldn't have given them all that money if we _____ her to.
A. wouldn’t advise B. won't advise
C. hadn't advised D. didn't advise
9. If the tree hadn't been so high, he _____ it up to take his kite down.
A. could have climbed B. climb
C. is climbing D. climbed
10. If the wall weren't so high, he _____ it up to take his ball down.
A. climbed B. could climb C. is climbing D. climb
11. If I _____ her phone number, I _____ her last night
A. had known / could have phoned B. knew / would have phoned
C. know / can phone D. knew / could phone
12. If he ______ the truth, the police wouldn’t arrest him.
A. tells B. told C. had told D. would tell
13. If you press that button what _____?
A. would happen B. would have happened
C. will happen D. happen
14. She says if she _____ that the traffic lights were red she _____.
A. had realized / would stop B. realized / could have stopped
C. has realized / stopped D. had realized / would have stopped
15. I am very thin. I think, if I _____ smoking, I might get fat.
A. stop B. had stopped C. will stop D. stopped
16. If I _____ that yesterday, I _____ them.
A. had discovered / would inform
B. had discovered / would have informed
C. had discovered / could inform
D. discovered / can inform
17. If you _______ to the course regularly, they ________ a certificate last year.
A. go / gave B. go / give
C. had gone / would have given D. went / would give
18. I think he is not at home. If he _____ in, he ______ the phone.
A. was / answered B. were / would answer
C. were / would have answered D.had been / would have answered
19. If I ______ in London now, I could visit British Museum.
A. were B. had been C. have been D. would be
20. If Columbus _______ money from Queen Isabella, he _______ across the Atlantic.
A. do not receive / could not sail
B. had not received / might not have sailed
C. did not receive / might not have sailed
D. would not receive / might not sail
I)Khoanh tròn a,b,c hoặc d cho câu trả lời đúng nhất(7p):
1)She hasn't finished the letter........................
a)already b)just c)yet d)never
2) Lan is studying hard.......................pass the final exam.
a)for b)in order to c)so to d)as to
3)It's too cold outside. Would you mind.......................the window?
a)to close b)close c)closed d)closing
4)Would you like to the movies tonight?
Sorry, I can't . I.......................my homework this evening.
a)am doing b)do c)will do d)doing
5) The teacher.................to the principal is in charge of my class.
a) talks b) is talking c) talking d) to talking
6) The bike.......................in Japan is $ 100.(making, made,is making, to make)
a)making b)made c)is making d)to make
7)We....................... dinner when the phone rang.
a)are having b)had c)have had d)were having
8) Color television ..... by John Logie Bard in 1982.
a)invented b)was invent c)was invented d)has invented
9) He said that he.......................for a car company.
a)worked b)works c)is working d)has worked
10) Do you know where.......................? -No, he didn't
a)Tom has gone b)has Tom gone c) did Tom go d)Tom went
IIViết lại các câu sau sao cho nghĩa không đổi so với câu trước :(1,5p)
1) Is it all right if I take some photographs?
- Would you mind if I took some photographs?
2) " We like this place" the tourists said.
- The tourists said that they liked that place.
III) Dùng already hoặc yet để hoàn thành các câu sau:(1.5p)
Example : I/ bought/ a jacket.
I have already bought a jacket.He/ not finish/his project.He has not finished his project yet.
1)David/ leave/ the party.
=> David has already left the party.
2) I/ not receive/ his letter.
=> I haven't received this letter yet.
I. Choose the best answer to complete these sentences :
1. In the world , millions of old papers ...... away everyday.
a. thrown b. are throwing c. are thrown d. threw
2. Every milk bottle can be ...... thirty times.
a. recycled b. reused c. reduced d. returned
3. I am happy .............. all the exams.
a. passing b. to pass c. pass d. passed
4. She was very sad .........good marks in the final test.
a. not get b. not to get c. to not get d. not getting
5. It's ........................... to travel around Vietnam.
a. interesting b. interested c. interestingly d. interestedly
6. The ruler ........................ of plastic is Mai's .
a. making b. to make c. is made d. made
7. The man ..................... to the principal is my English teacher.
a. talks b. is talking c. talking d. to talk
8. Do you mind if I ................. the window ?
a. open b. to open c. opened d. opening
9. Would you mind .................... the washing up for me tonight ?
a. doing b. did c. to do d. done
10. Tim ................................ rice paddies before( a. never saw. phần này có lẽ loại nhỉ )
a. never saw b. never seen c. has never seen d. never to see
I/ Trắc nghiệm: Chọn câu trả lời đúng nhất
1. The weather .................. nice yesterday.
a. is b. was c. will be d. has been
2. It's difficult ................ your direction.
a. to follow b. following c. to following d. followed
3. Would you mind .............. in the front of the Taxi, Mark?
a. sit b. to sit c, sitting d. siting
4. The boy ................. over there is my brother.
a. stand b. stood c. standing d. being stood
5. I was cooking for dinner ...........................................
a. Then the phone rang b. then the phone was ringing
c. When the phone rang d. when the phone was ringing.
6. The leader said that ................... to award the prize to you .
a. He is pleasing b. he was pleasing
c. he is pleased d. he was pleased
7. On Christmas Eve, people often ...................... a tree
a. are decorated b, were decorated c. decorating d. decorate
8. He asked me ..................................
a. Where I like coffee or not b, Whether I liked coffee
c. What I liked coffee d, Which I liked coffee
9. What's was wrong with your printer?
a. It didn't work b, It's doesn't c, It hasn't work d, It won't work.
10. The Statue of Liberty was ................. to the USA by the French.
a. contructed b, designed c, completed d, presented
1. Cool the burns immediately so as to ............ tissue damage
A. ease B. relieve C. minimize D. maximize
2. Milk bottles can be ..................after being cleaned
A. reused B. recycle C. thrown away D. broken
3. The old lamp ............... in china is five dollars
A. make B. makes C. to make D. made
4. Millions of Christmas cards ...............every year
A. were sent B. are sent C. send D. is sending
5. He had his father..................... his watch
A. fixed B. fixing C. to fix D. fix
6. He asked me ............... a driving license
A. if I have B. whether I have C. if I had D. whether I have had
1. The 23rd Sea games____________ in the Philippines.
a. will hold b. will held c. would be held d. is held
2. She asked me if I _________pop music
a. like b. to like c. will like d. liked
3. I ______it 5 years ago
a. have seen b. saw c. was seeing d. am seeing.
4. It's very kind ________you to help me.
a. for b. at c. off d. of
5. Would you mind ________I smoked here.
a. When b. that c. if d. for
6. The old lamp ________in China is 5 dollars
a. to be making b. making c. mode d. make
7. Millions of Chirsmas card _______every year.
a. were sent b. are sent c. send d. is sending.
8. I don't know how _________the game
a. playing b. to play c. player d. can I play
I/ Trắc nghiệm: Chọn câu trả lời đúng nhất
1. The weather .................. nice yesterday.
a. is b. was c. will be d. has been
2. It's difficult ................ your direction.
a. to follow b. following c. to following d. followed
3. Would you mind .............. in the front of the Taxi, Mark?
a. sit b. to sit c, sitting d. siting
4. The boy ................. over there is my brother.
a. stand b. stood c. standing d. being stood
5. I was cooking for dinner ...........................................
a. Then the phone rang b. then the phone was ringing
c. When the phone rang d. when the phone was ringing.
6. The leader said that ................... to award the prize to you .
a. He is pleasing b. he was pleasing
c. he is pleased d. he was pleased
7. On Christmas Eve, people often ...................... a tree
a. are decorated b, were decorated c. decorating d. decorate
8. He asked me ..................................
a. Where I like coffee or not b, Whether I liked coffee
c. What I liked coffee d, Which I liked coffee
9. What's was wrong with your printer?
a. It didn't work b, It's doesn't c, It hasn't work d, It won't work.
10. The Statue of Liberty was ................. to the USA by the French.
a. contructed b, designed c, completed d, presented
1. Cool the burns immediately so as to ............ tissue damage
A. ease B. relieve C. minimize D. maximize
2. Milk bottles can be ..................after being cleaned
A. reused B. recycled C. thrown away D. broken
3. The old lamp ............... in china is five dollars
A. make B. makes C. to make D. made
4. Millions of Christmas cards ...............every year
A. were sent B. are sent C. send D. is sending
5. He had his father..................... his watch
A. fixed B. fixing C. to fix D. fix
6. He asked me ............... a driving license
A. if I have B. whether I have C. if I had D. whether I have had
1. The 23rd Sea games____________ in the Philippines.
a. will hold b. will held c. would be held d. is held
2. She asked me if I _________pop music
a. like b. to like c. will like d. liked
3. I ______it 5 years ago
a. have seen b. saw c. was seeing d. am seeing.
4. It's very kind ________you to help me.
a. for b. at c. off d. of
5. Would you mind ________I smoked here.
a. When b. that c. if d. for
6. The old lamp ________in China is 5 dollars
a. to be making b. making c. made d. make
7. Millions of Chirsmas card _______every year.
a. were sent b. are sent c. send d. is sending.
8. I don't know how _________the game
a. playing b. to play c. player d. can I play
Choose the best answer for each of the fllowing sentences
1. ............ if you work harder, you will be sacked.
A. Whether B. If C. However D. Unless
2. 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
3. If you take the ice out of the fridge, it ...........
A. vaporizes B. melts C. heats D. disappears
4. 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
5. 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
6. Unless we .......... more snow, we can't go skiing.
A. will have B. have C. have had D. had
7. You'll fail the exam ........... you start revising.
A. if B. until C. when D. unless
8. Unless you wash the car, you .............. not drive it at the weekend
A. would B. could C. have to D. may
9. If Peter ............... his car before the drive, he ................ the problem of out of petrol.
A. cheked / will not get B. had checked / would not have got
C. checks / will not have got D. would be checking / will not have got
10. 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 step on the mine, it wouldn't have exploded.
1/. She fell off a bike and…………. her head on the road. .
a. hited b. hit c. hitted d. hiting
2/. Would you mind if I ………………a photo.
a. take b. took c. taking d. to take
3/. Mount Rush more can be……………from more than 100 kilometers
a. see b. saw c. seen d. been seen
4/. My friend is always………………in class.
a. talked b. talking c. talks d. told
5/. she asked me ………………a driving licence.
a. if I have b. whether I have c. if I had d. whether I have had
6/ Nylon......................in the 1930's
A. invented B. is invented C. was invented D. has been invented
7/ The librarian asked us ........................ so much noise
A. don't make B. not make C. not making D. not to make
8/ would you mind......................... off the TV, please?
A. return B. returning C. returns D. returned
9/It’s dangerous …………….in the river.
A.swim B.to swim C.swimming D.swam
10/ ……….you mind if I smoke ?
A.could B.Don’t C.Do D.would
11/Milions of Christmas cards …………every year.
A.were sent B.are sent C.send D.is sending
12/. When will the project be ………….……..?.
A. to start B.start C.started D.starting
13/ It's difficult.................. your directions.
a/ to follow b/ following c/ follow d/ followed.
14/ Milk ....................to the houses by the milk man everyday.
a/ brings b/ is bring c/ is brought d/ has brought.
15/ Would you mind if I ..................off the TV ?
a/ turned b/ turning c/ turns d/ turn
16/ While Hoa...................the phone rang
a/ was eating b/ is eating c/ eating d/ were eating.
17/ In the .................contest , one person from each team has to run to the river to get water.
a/ bull fighting b/ ice skating c/ water-fetching d/ weight lifting.
18/ She said she .................. a good teacher.
a/ is b/ are c/ were d/ was
19/ He asked me .....................I knew the Phong Nha cave.
a/ whether b/ if c/ Do d/ a and b are OK