Circle the answer that correctly completes each sentence. 1. The Incas didn’t have any sophisticated machines or work a...

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Hồng Ngọc

12 tháng 10 2017 lúc 18:40

Choose the best answer to complete each of the following sentences. 1. He _____ playing with his dog. A. is loving B. loves C. was loving D. love 2. Oil _____ if you pour it on water. A. floated B. floats C. will be floated D. float 3. Water _____ at 100 degrees Celsius. A. boils B. boiling C. is boiling D. boil 4. The launch of the first liquid-fuelled rocket in 1926 _____ by flight historians _____ as significant as the Wright Brothers’ flight. A. has considered - having been B. was conside...

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Choose the best answer to complete each of the following sentences. 1. He _____ playing with his dog. A. is loving B. loves C. was loving D. love

2. Oil _____ if you pour it on water. A. floated B. floats C. will be floated D. float

3. Water _____ at 100 degrees Celsius. A. boils B. boiling C. is boiling D. boil

4. The launch of the first liquid-fuelled rocket in 1926 _____ by flight historians _____ as significant as the Wright Brothers’ flight. A. has considered - having been B. was considered - being C. is considered - to be D. has been considered - has been

5. I’m afraid John will get drunk at the party no matter what his wife _____ to prevent it. A. would do B. were doing C. does D. will do

6. “Any news from Vicky?” “Yes. She _____ tomorrow on the 9:15 train.” A. arrives B. will have arrived C. arriving D. will have been arriving

7. “Do you know it’s Barb’s birthday today?” “Yes, she _____ a party tonight.” A. has B. is to have C. is having D. will have 8. Tom _____ things round the house, which is annoying. A. always leaves B. has always left C. is leaving D. is always leaving

9. Teenagers _____ photos of pop stars on their bedroom walls. A. are often sticking B. often stick C. will often stick D. have often stuck

10. At least half of the world’s population _____ more than one language. A. speak B. speaks C. have spoken D. is speaking 11. “Did you have a good time at the .Browns?” “Not really. I _____ I’ll ever visit them 2 www.tailieuquyhiem.com again.” A. won’t be thinking B. am not thinking C. don’t think D. think not

12. Today, universities _____ of conducting “cruel and unnecessary” tests on animals, _____ banned drugs such as amphetamines. A. are accused - using B. have accused - to use C. have been accused - used D. are being accused - being used 13. “George is in hospital.” “Yes, I’ve heard he _____ good progress.” A. makes B. will make C. is making D. would make 14. My neighbor really gets on my nerves. She _____ the washing machine on late at night. A. has always put B. had always put C. has always been putting D. is always putting

15. The word “Olympic” _____ from Olympian in Greece. A. has come B. came C. comes D. is coming

16. Three swimmers, Paul, Ed, and Jim, _____ now in the competition for medals. A. is B. has been C. had been D. are

17. “Could I have a word with you, please?” “Sorry, I’m in a big hurry. My train _____ in 15 minutes.” A. is leaving B. left C. has left D. will leave

18. I _____ an important phone call from America. Could you tell me when it comes? A. had expected B. have been expected C. expected D. am expecting

19. The existence of many stars in the sky _____ us to suspect that there may be life on another planet. A. lead B. leading C. have led D. leads

20. _____, insist on a full refund. A. Whatever he will say B. Whatever he said C. Whatever he says D. Whatever he would say Choose the underlined part among A, B, C or D that needs correcting.

21. A star that (A) has used up its (B) energy and has lost its heat (C) became (D) a 3 www.tailieuquyhiem.com black dwarf. 22. Mr. Suzuki Wants to know (A) where the supplies are kept (B), in case he need (C) more of them (D) while we’re away. 23. In some areas, it has (A) against the law (B) to ride (C) a motorcycle without (D) a helmet.

24. The novel and the short story are the literary forms (A) most commonly called (B) “fiction”, but contemporary narrative (C) poetry and drama were (D) also forms of fiction. 25. When the minerals needed for (A) corn to grow (B) are lack (C), the husks may be stunted (D). TEST 1.1.2 (Present Perfect) Choose the best answer to complete each of the following sentences.

1. You _____ much recently. A. weren’t studying B. don’t study C. haven’t been studying D. didn’t study

2. “Where’s Tony?” “He _____ to the travel agent’s, and he hasn’t come back.” A. has been B. has been going C. has gone D. had gone

3. I’m sorry, but the director _____ the office. A. already left B. has left C. had left D. is leaving

4. For several years his ambition _____ to become a pilot. A. is B. has been C. was . D. had been

5. She said she met you once at the Hilton last year. _____ since then? A. Have you met her B. Did you meet her C. Were you met her D. Had you met her

6. We think they _____ all that is necessary. A. have done B. doing C. had done D. would do

7. I _____ here since last September. A. am studying B. have been studying C. had been studying D. was studying 4 www.tailieuquyhiem.com

8. I think I _____ my door key. I can’t find it anywhere. A. lost B. am losing C. have lost D. will lose

9. Mr. Kdwards _____ history for 35 years, and is retiring soon. A. teaches B. is teaching C. taught D. has been teaching 10. I’d like to see that football match because I _____ one this year. A. don’t see B. can’t see C. hardly see D. haven’t seen 11. Once an animal _____ from the wild, it generally cannot be returned to its place of origin for fear of disease. A. was taken s B. will be taken C. would be taken D. has been taken 12. I’m tired. I _____ the house since 9 this morning. A. am cleaning B. was cleaning C. had been cleaning D. have been cleaning 13. I _____ to your excuses carefully, but I _____. A. listen - do not convince B. am listening - was not convinced C. had listened - have not been convinced D. have listened - am not convinced 14. I _____ can’t believe that you _____ all the three exercises. You just started five minutes ago. A. have finished B. have been finishing C. finished D. are finishing 15. Up to now, the discount _____ to children under ten years old. A. has only applied B. only applies C. was only applied D. only applied 16. Tom often watches TV after his parents _____ to bed. A. had gone B. have gone C. go D. went 17. This is the third time James _____ the volunteer program to the village. A. joins B. joined C. has joined D. has been joining 18. “How’s Peter doing?” “I don’t know. I _____ from him for months.” A. have to hear B. haven’t heard C. didn’t hear D. don’t hear 5 www.tailieuquyhiem.com 19. “Susan is still looking for a decent flat.” “How long _____ for?” . A. was she looking B. is she looking C. had she looked D. has she been looking 20. “Has Tim come to terms with his exam results?” “Yes. He _____ the fact he’ll have to resit.” A. had accepted B. has been accepting C. accepted D. has accepted 21. “How do you like your sushi?” “Well, it’s really different. It’s the first time I _____ Japanese food.” A. eat B. am eating C. have eaten D. have been eating 22. Their children _____ lots of new friends since they _____ to that town. A. have made - moved B. were making - have moved C. made - are moving D. made - have been moving 23. It has been a good year. I _____ two books and several short stories, all of which are now in print. A. have written B. have been writing C. will have written D. had written 24. You should know that everyone in this office _____ busily planning the dance for a week. A. is B. has been C. have been D. are 25. Jane is a wonderful singer. Her mother tells me that she _____ professionally since she was four. A. has been sung B. was singing C. is singing D. has been singing 26. That the committee members could not agree with each other about solving that problem _____ caused a serious problem. A. is B. was C. has D. have 27. Prices _____ considerably since this time last year. A. have raised B. rose C. raised D. have risen 28. The number of working women in China _____ from 49% in 1980 to nearly 65% today. 6 www.tailieuquyhiem.com A. has been increasing B. has increased C. is increasing D. have increased 29. She _____ two miles and a half, and now she feels exhausted. A. runs B. was running C. has run D. has been running 30. Something tells me that you _____ to a single word I _____ in the past ten minutes. A. haven’t been listening - have said B. haven’t listened - had said C. hadn’t listened - said D. didn’t listen - was saying 31. How many of those chocolates _____ today? A. did you eat B. do you eat C. had you eaten D. have you eaten 32. This is the latest news from Timbuktu. Two-thirds of the city _____ in a fire. A. has been destroyed B. were destroyed C. was destroyed D. have been destroyed 33. Our industrial output _____ from $2 million in 2011 to $4 million this year. A. rises B. rose C. was rising D. has risen 34. The replacement of shops such as the groceries’ and chemist’s by cafes _____ the housewives with insufficient facilities for shopping. A. leave B. have left C. has left D. to have left 35. He off alone a month ago, and _____ of since. A. set - hasn’t been heard B. setted - hasn’t heard C. set - hasn’t heard D. setted - hadn’t been heard 36. .You looked tired. _____ hard all day? A. Have you been working B. Did you work C. Do you work D. Are you working 37. Thousands of antibiotics _____, but only about thirty are in common use today. A. have developed B. are developing C. have been developed D. have been developing 38. None of the students _____ to class yet. A. are coming B. hadn’t come C. haven’t come D. have come 7 www.tailieuquyhiem.com 39. We _____ for three hours and are very tired. A. are walking B. have been walking C. were walking D. had been walking 40. I _____ badminton before. This is the first time I _____ to play it. A. have never played - tried B. have ever played - have tried C. have played - have tried D. have never played - have tried 41. “Are you learning your lesson?” “No, I _____ it.” A. finished B. finish C. have finished D. have been finished 42. lie is tired how. He _____ for a long time. A. has been learning B. learns C. has been learned D. learned 43. Listen, Donna, I don’t care if you _____ the bus this morning. You _____ late for work too many times. You are fired! A. have missed have been B. missed - have been C. missed -- were D. were missing - were 44. “Joseph’s English _____, isn’t it?” - “Yes. He _____ American television programs everyday since he first arrived in San Diego. Soon he will be totally fluent.” A. is really improving - has been watching B. has really improved - has watched C. really improved - watches D. is really improving - watches 45. For the last ten years, engineers _____ noise levels in Britain’s cities. A. have been measured . have been measuring C. has measured D. have been measurement Choose the underlined part among A, B, C or D that needs correcting. 46. Since ancient times (A), some people wore (B) amulets, objects that are supposed (C) to give the wearer magical (D) powers. 47. I will come to (A) your (B) office as soon as I prepare (C) this (D) report. 48. Our lifestyle (A) changed (B) since running water (C) came to (D) our village. 49. As soon (A) as he will graduate(B), he is going (C) to return to (D) his hometown. 8 www.tailieuquyhiem.com 50. We haven’t (A) seen each (B) other from (C) we left school. (D)

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Lớp 12 Tiếng anh Luyện tập tổng hợp

ninja_u23vn

16 tháng 11 2018 lúc 20:57

Read the text below and look carefully at each line. Some of the lines are correct but some have a word which should not be there. If a line has a word which should not be there, write the word at the end of the line. PROBLEMS WITH A FRIEND Susie Williams has been my best friend ever since we were being at primary school together, and last week she told me some good news. She had decided not to marry with her boyfriend. They had been going out together for about two years, and got engaged last...

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Read the text below and look carefully at each line. Some of the lines are correct but some have a word which should not be there. If a line has a word which should not be there, write the word at the end of the line.

PROBLEMS WITH A FRIEND

Susie Williams has been my best friend ever since we were being at primary school together, and last week she told me some good news. She had decided not to marry with her boyfriend. They had been going out together for about two years, and got engaged last Christmas. I was never happy about their relationship, as I thought so that he was not the right partner for her. I always felt that if they had of got married, she would have completely lost her independence because he would have to made her give up her studies and stay at home all the day. Susie would have hated that, as I know that she is a very ambitious person, but when I was mentioned it to her she became quite angry, saying that I was jealous her, and wanted him for myself. Sometimes it isn't easy being a best friend.

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Lớp 12 Tiếng anh Luyện tập tổng hợp

ninja_u23vn

16 tháng 11 2018 lúc 20:59

Read the text below and look carefully at each line. Some of the lines are correct but some have a word which should not be there. If a line has a word which should not be there, write the word at the end of the line. PROBLEMS WITH A FRIEND Susie Williams has been my best friend ever since we were being at primary school together, and last week she told me some good news. She had decided not to marry with her boyfriend. They had been going out together for about two years, and got engaged last...

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Read the text below and look carefully at each line. Some of the lines are correct but some have a word which should not be there. If a line has a word which should not be there, write the word at the end of the line.

PROBLEMS WITH A FRIEND

Susie Williams has been my best friend ever since we were being at primary school together, and last week she told me some good news. She had decided not to marry with her boyfriend. They had been going out together for about two years, and got engaged last Christmas. I was never happy about their relationship, as I thought so that he was not the right partner for her. I always felt that if they had of got married, she would have completely lost her independence because he would have to made her give up her studies and stay at home all the day. Susie would have hated that, as I know that she is a very ambitious person, but when I was mentioned it to her she became quite angry, saying that I was jealous her, and wanted him for myself. Sometimes it isn't easy being a best friend.

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Lớp 12 Tiếng anh Luyện tập tổng hợp

Lê Đỗ Nhật Linh

25 tháng 7 2018 lúc 11:34

Choose the best answer to complete the following sentences. 1. Children get present ______ Christmas and ______ their birthday. (at ... at / on ... on / on ... at / at ... on) 2. If you are going to the post office, would you post a letter ______ me? (to / at / on / for) 3. The windows haven’t been cleaned ______ weeks. (ago / since / for / to) 4. We usually go to our home village at least once ______ the summer. (in / on / to / for) 5. He said that John ______ up his job. (has given /...

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Choose the best answer to complete the following sentences. 1. Children get present ______ Christmas and ______ their birthday. (at ... at / on ... on / on ... at / at ... on) 2. If you are going to the post office, would you post a letter ______ me? (to / at / on / for) 3. The windows haven’t been cleaned ______ weeks. (ago / since / for / to) 4. We usually go to our home village at least once ______ the summer. (in / on / to / for) 5. He said that John ______ up his job. (has given / have given / had given / had to give) 6. When I saw Susan, she said she was taking her driving test ______. (today / the next day / tomorrow / the tomorrow) 7. My TV is broken. I wish it ______ soon. (would be repaired / is repaired/ was repaired / will be repaired) 8. I have lived with my parents. I wish I ______ an apartment. (will have / had / would / has) 9. Have you ever wished you ______ to ski when you were younger? (will learn / could learn / learn / can learn) 10. Sometimes he wishes he ______ a different career when he graduates. (can choose / choose / will choose / could choose) 11. Matthew said he was meeting a friend at the station later ______. (that day / yesterday / tomorrow / this today) 12. The astronauts have alrea dy been in orbit ______ two days. (since / for / till / to) 13. We have lunch from 12.00 ______ 1.00. Then we start again go on______ 5.30. (to ... at / from ... to / to ... to / to ... till) 14. She said that she ______ to learn to drive. (is going / go / goes /was going) 15. She asked me ______ I liked pop music. (if / that / what / when) 16. She said that she was going away for a few days and ______ phone me when she got back. (will / must / would / shall) 17. I’ve lived in this street ______. (in 1998 / for 1998 / since 1998 / tomorrow) 18. I want two seats for Romeo and Juliet ______ Friday night. (on / in / at / to) 19. Our train arrived in York ______ 6.00. (in / for / on / at) 20. There was an accident at the crossroads ______ midnight last night. (at / for / on / in) 21. She said she ______ come to the party on Friday. (won’t / doesn’t / can’t / couldn’t) 22. I’m going to swim ______ Monday with Tom. (at / on / for / of) 23. If my watch is broken, I ______ buy a new one because I always need one. (have to/ might / have / may) 24. I have got an awful headache. If I see a chemist’s, I ______ buy someaspirins. (must / might / may / should to) 25. I plan to travel around the world. If I don’t visit my father in Japan this year, I ______ go to the USA. (must / have / may / ought to) 26. If you want to get good grades, you ______ study hard. (must / ought / have / have) 27. Let’s wait ______ it stops raining. (until / for / to / since) 28. I have lived in this house ______. (ago six years / in six years / since six years / for six years) 29. Columbus discovered America ______ the 15th century. (in / since / for / on) 30. The course begins ______ 8 am ______ 5 pm. (from ... during / from ... since / from ... to / in ... to)

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Lớp 12 Tiếng anh Luyện tập tổng hợp

le minh thanh

16 tháng 8 2017 lúc 22:30

1. I enjoyed the movie very much. I wish I ______ the book from which it was made. A. have read B. had read C. should have read D. am reading 2. You are late. If you _______ a few minutes earlier, you_______him. A. came / Would meet B. had come / Would have met C. come / Will meet D. had come / would meet 3. I can’t stand him. He always talks as though he_______everything. A. knew B. kn...

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1. I enjoyed the movie very much. I wish I ______ the book from which it was made.

A. have read B. had read C. should have read D. am reading

2. You are late. If you _______ a few minutes earlier, you_______him.

A. came / Would meet B. had come / Would have met
C. come / Will meet D. had come / would meet

3. I can’t stand him. He always talks as though he_______everything.

A. knew B. knows C. has know D. had known

4. His doctor suggested that he ______short trip abroad.

A. will take B. would take C. take D. took

5. We might have failed if you _______us a helping hand.

A. have not given B. would not give C. had not given D. did not give

6. The law requires that everyrone ______his car checked at least once a month.

A. has B. have C. had D. will have

7. He was busy yesterday, otherwise he_______to the meeting.

A. would come B. would have been
C. could have been D. would be

8. If there were no subjunctive mood, English _______ much easier.

A. will be B. would have been
C. could have been D. would be

9. ________ the fog, we should have reached our schoo1.

A. Because of B. In spite of C. In case of D. But for

10. –“What will you do during winter vacation?”

–“I don’t know, but it’s about time______something.”

A. I decided B. I’ll decide C. I’d decided D. I’m deciding

11. He was very busy yesterday, otherwise, he ________to your birthday party.

A. would come B. came
C. would have come D. should come

12. The two strangers talked as if they_______friends for years.

A. should be B. had been C. have been D. were

13. Look! What you’ve done!You_______have been more careful.

A. should B. may C. ought D. would

14. Without electricity, what _______?

A. will the world be like B. would the world be like
C. the world will be like D. the World Would be like

15. With your ability, you _______out the puzzle within a few minutes.

A. could have worked B. need have worked
B. C. ought have worked D. must have worked

giup mk vs mn oi

thanks mn nhiu

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Lớp 12 Tiếng anh Luyện tập tổng hợp

Dennis

9 tháng 3 2017 lúc 9:18

fill in each space in the following passage with one suitable world. Computers play an important role in our everyday lives, sometimes without us even realizing it. Consider the use (1)............ computers in both shops and offices. Big shops especially chain stores with branches all over the country, have to deal with very large amounts of information. They have to make (2)................. that there are enough goods on the selves for customers to buy; they need to be (3)...............

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fill in each space in the following passage with one suitable world.

Computers play an important role in our everyday lives, sometimes without us even realizing it. Consider the use (1)............ computers in both shops and offices. Big shops especially chain stores with branches all over the country, have to deal with very large amounts of information. They have to make (2)................. that there are enough goods on the selves for customers to buy; they need to be (3).............. to re-order befora stocks (4).............. out, to decide which things are selling well and (5)........... on. All these processes (6)........... performed quickly and afficiently by computers. A (7)............... of offices work in the past involved information on paper. (8)................... it had been dealt with by people, the paper was put (9)............. for future reference. This way of working was (10).............. particularly easy or fast. A computerized system is much more efficient.

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Lớp 12 Tiếng anh Luyện tập tổng hợp

Nguyễn Thanh Thiện

8 tháng 4 2020 lúc 14:46

WEEK 3 PASSIVE VOICE Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. 21. Your shirt needs__________. A. ironing B.be ironing C. to iron D. iron 22. When you are on duty, your uniform must __________ at all times. A. wear B. be wear C. be worn D. be wearing 23. Bill ______...

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WEEK 3 PASSIVE VOICE

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

21. Your shirt needs__________.

A. ironing B.be ironing C. to iron D. iron

22. When you are on duty, your uniform must __________ at all times.

A. wear B. be wear C. be worn D. be wearing

23. Bill __________ to the party tomorrow.

A. will be invited B. will invite

C. will have invited D. will have been invited

24. Vitamin C ________by the human body. It gets into the bloods stream quickly.

A. absorbs easily B. is easily absorbing

C. is easily absorbed D. absorbed easily

25. More than 50 films _________ in HCMC since June.

A. were shown B. had been shown C. have been shown D. have shown

2 6.I have my bicycle_______ by him.

A. repaired B. be repaired C. To repair D. repair

27. A: “ When ________? ” - B: “ In 1928”

A. penicillin was discovered B. did penicillin discovered

C. was penicillin discovered D. did penicillin discover

28. I didn't realize that somebody was recording our conversation.

A. I didn’t realize that our conversation was recorded.

B. I didn't realize that our conversation was being recorded.

C. I didn't realize that our conversation were being recorded.

D. Our conversation wasn't realized to be recorded.

29.People warned us not to go out alone.

A. We were warned not going out alone

B. We are warned not to go out alone.

C. We weren't warned to go out alone.

D. We were warned not to go out alone.

30. The skyscraper is said to have been built in 1930.

A. They said the skyscraper was built in 1930.

B. It was said that the skyscraper was built in 1930.

C. They are said the skyscraper is built in 1930.

D. It is said that the skyscraper was built in 1930.

21. These computers will be _______ in the lesson.

A. used B. use C. using D. be used

Can’t we do something about the situation?”- “ Something _____ right now.”

A. is doing B. is do C. is being done D. has been doing

The university ____ by private funds as well as by tuition income.

A. is supported B. supports C. is supporting D. has supported

My wedding ring _________of yellow and white gold

A. is made B. is making C. made D. making

My shirt _______ by my sister on my last birthday.

A. gave B. was given C. had been given D.was being given

This picture _______ by Johnny when I came.

A. painted B. was painted C. was being painted D.had been painted

It must ______ without delay.

A. do B. have been done C. be doing D. be done

This exercise may _______ with a pencil.

A. be written B. be to write C. be writing D. write

The money ______ to him 2 months ago, but it ______ back yet.

A. was lent/ had not been given B. has been lent/ was not given

C. was lent/ has not given D. was lent/ has not been given

I still can not believe it. My bicycle ______ some minutes ago.

A. was stolen B. was stealing C. stolen D. stole

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Lớp 12 Tiếng anh Luyện tập tổng hợp

Hermione Granger

10 tháng 6 2018 lúc 10:53

Fill in the blanK: living in a modern World may have its advantages but it(1)............. has its disadvantages that one disadvantages of the modern way of life which stands(2)............. from the rest is the negative influence cars have(3)............. The environment. Today, all developed societies face a(4)........... range of problems Caused by cars and(5).........vehicles. These include air and noise pollution,(6)...........traffic and the ever growing numbers in f roads in our cit...

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Fill in the blanK: living in a modern World may have its advantages but it(1)............. has its disadvantages that one disadvantages of the modern way of life which stands(2)............. from the rest is the negative influence cars have(3)............. The environment. Today, all developed societies face a(4)........... range of problems Caused by cars and(5).........vehicles. These include air and noise pollution,(6)...........traffic and the ever growing numbers in f roads in our cities. Major cities around the world face considerable environmental damage (7)............ of this and are in need of serious measures to reverse this trend.

How did we end (8)..........with such a problem? There are no simple answers(9)............. this question and no serious effort has been made to find either.it is about (10)...........,however, that our generation got serious (11)...........this issue. People must be willing to stand (12).......... environmental groups and make any effort necessary to change the situation. Many Environmentalists Believe that we could help by using our(13)......sense. Car poolling for instance could be a solution to the problem.this simple program calls for people to share their cars with fellow workers to and from work got a lot of interest has been shown (14).......car poolling and other more ambitious programmes are plan for the future

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Lớp 12 Tiếng anh Luyện tập tổng hợp

Từ Minh Thuận

24 tháng 12 2019 lúc 19:43

WHY DO ANIMALS GO EXTINCT? Different kinds of animals have appeared and disappeared throughout Earth’s history. Some animals go extinct because the climate (4)_______ they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or adapt, to the new climate, they die. Some animals go extinct because thay cannot (5) _______ with other animals for food. Some animals go extinct because they are killed b...

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WHY DO ANIMALS GO EXTINCT?

Different kinds of animals have appeared and disappeared throughout Earth’s history. Some animals go extinct because the climate (4)_______ they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or adapt, to the new climate, they die.

Some animals go extinct because thay cannot (5) _______ with other animals for food. Some animals go extinct because they are killed by enemies. New kinds of animals are always evolving. Evolving means that the animals are changing (6) _______ from generation to generation. Small differences between parents, children, and grandchildren slowly add up over many, many generations. Eventually, a different kind of animal evolves.

Sometimes many of the animals on Earth go extinct at the (7) _______ time. Scientists call this a mass extinction. Scientists think there (8) _______ at least five mass extinctions in Earth’s history. The last mass extinction happened about 65 million years ago. This mass extinction killed off the dinosaurs.

Question 4: A. where B. which C. when D. what

Question 5: A. complete B. find C. compete D. exist

Question 6: A. accidentally B. suddenly C. quickly D. slowly

Question 7: A. same B. similar C. different D. various

Question 8: A. has been B. have been C. will be D. are

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