19. It ________that the mysterious visitor was an old friend of my grandmother.
A. turned up
B. turned off
C. turned on
D. turned out

20. Let’s have a get-together on the weekend, ________?
A. shall we
B. will we
C. shan’t we
D. won’t we

21. Living in the central American desert has its problems,________ obtaining water is not the least.
A. of which
B. for what
C. as
D. whose

22. Although _______happened in that developed country sounds like science fiction, it could occur elsewhere in the world.
A. which
B. what
C. how
D. it

23. The door over there needs _________.
A. painted
B. painting
C. has painted
D. paint

24. You _______yesterday if you were really serious about the job.
A. ought to come
B. ought to be coming
C. ought to have come
D. ought have come

25. He demanded that the problem _______at once.
A. would be solved
B. is to be solved
C. is solved
D. be solved

26. It was not until the accident happened _______.
A. when I became aware of my foolishness
B. when my foolishness became obvious
C. that did I realize my foolishness
D. that I became aware of my foolishness

27.As we know, physics _______the science of energy.
A. was
B. were
C. is
D. are

28. The train _______of the station right on time.
A. pulled
B. pulled down
C. pulled on
D. pulled out

29. I like this song_______ your opinion.
A. in spite
B. despite of
C. regardless of
D. likewise

30. ______you say, he won’t listen to you.
A. No matter where
B. No matter what
C. However
D. whichever

31. Where did you get your watch ________?
A. repair
B. to repair
C. repaired
D. repairing

32.He didn’t come yesterday. He ______busy working in the lab.
A. must be
B. would have been
C. must have been
D. would be

33. ______, he must be totally exhausted after a two weeks’ trip by bus.
A. Being very strong
B. A a strong man
C. Strong as he is
D. As he is strong