Sagot :
Answer:
1. b
2. c
3. d
4. a
5. a/c
6. b
7. a
8. a
9. b
10. a
11. c
12. a
13. a
14. d
15. c
16. d
17. b
18. b
19. d
20. a
1. They have been running for 3 hours when the storm suddenly broke.
2. No matter what happens next I will help you.
3. I have come to the conclusion that nowadays nobody cares about anything.
4. I assumed you have been paying for the repairs until the end of last year.
5. Do you ever get tired of answering the same questions every day?
6. She has been working on that manuscript for 2 years now.
7. I _ went there once a long time ago and have not been back since.
8. She _kept trying to pass her driving test but fails every time.
9. I _want complete silence now while I try this experiment.
10. The students are usually taught by Mrs. Monty. However, this week they are being taught by Mr. Tanzer.
11. In the last hundred years, traveling became much easier and more comfortable.
12. In the 19th century, it took _two or three months to cross North America by covered wagon.
13. In the past the trip was very rough and often dangerous, but things _ have changed a great deal in the last hundred and fifty years.
14. Now you can fly from New York to Los Angeles in a matter of hours.
15. When Carol called last night, I watched my favorite show on television.
16. By this time next summer, you will have complete your studies.
17. Right now, Jim _is reading _ the newspaper and Kathy is cooking dinner.
18. Last night at this time, they _were doing_ the same thing. She is cooking_ and he is reading the Newspaper.
19. When I have arrived home last night, I was discovering that Jane had prepared a beautiful candlelight dinner.
20. Sam was trying to change a light bulb when he slipped and fell .
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