16. I ______ ten minutes to decide whether I should reject the offer.
A. gave
B. was given
C. was giving
D. had given
17. The number of deer, mountain lions and wild roses ______ much if people leave things as they are.
A. doesn't change
B. don't change
C. change
D. changed
18. The police _______ the murderer everywhere when he suddenly appeared in a theatre.
A. is searching for
B. were searching for
C. are searching for
D. was searching for
19. ______ the bitter cold of an autumn morning, they went on a day excursion to the nearby island.
A. On
B. In
C. At
D. With
20. A clear, warm day suddenly grew chill ______ a dark curtain of rolling dust advanced across the plains.
A. until
B. as
C. so
D. since
21. These oil paintings have just been returned from _______ in a museum.
A. exhibited
B. exhibiting
C. being exhibited
D. having exhibited
22. ______ the fact that you were the first to solve the structure of DNA?
A. What you think accounts for
B. What do you think accounts for
C. Do you think that accounts for
D. What accounts for you think
23. A primary election is an election in an American state _____ for someone to become a candidate for a political office.
A. there people vote
B. people vote there
C. where people vote
D. what people vote
24. "But now I want peace," said the general, a smile ______ his face.
A. spread to
B. spread across
C. spreading to
D. spreading across
25. _____, lack of clean fresh water presents an even greater threat.
A. As bad as the air can be
B. The air can be as bad
C. Bad as the air can be
D. As the air can be bad
26. He would love ______ if they announced that they had come up with something half as good as his design.
A. that
B. it
C. them
D. /
27. _____, the less time it would take him to go to work.
A. If the traffic was less heavy
B. The less heavy the traffic would be
C. The less heavy the traffic was
D. The less heavy would the traffic be
28. -- Perhaps we can put the meeting off till next Tuesday.
-- That's what I ______ about when you came in.
A. thought
B. was thinking
C. would think
D. had thought
29. This poem ______ written by Shelley but I am not certain.
A. may have been
B. must have been
C. should have been
D. can have been
30. There are ______ people who have experienced similar risks.
A. such many
B. such a lot
C. a lot such
D. so many
参考答案：
1---20 A C C B D B C A B A D A A B D B A B B B
21---30 C B C D C B C B A D
