33. ____ she couldn’t understand was _____ fewer and fewer students showed interests in her lessons.

　A. What; why　　　 B. That; what　　　　 C. What; because　　　　 D. Why; that

32. --- I ‘ll ask our physics teacher to explain Newton’s Second Law of Motion she taught us yesterday.

----That’s just _______ most of the students haven’t understood.

A. what　　　　　 B. why　　　　　 C. how　　　　　 D. where

31. ______ surprised the family most was ________ the girl played basketball very well.

　　　 A. That; that　　　 B. That; what　　　　　 C. What; that　　　　　　 D.What; what

30. Someone is ringing the doorbell. Let’s see _________.

A. who is he 　　 　　 B. who he is 　　 　　 C. who is it 　　 　　　　D. who it is

29. The boss appeared ______ the accident and was not surprised at the news.

A. to know　　　　 B. to have known　　 　　 C. knowing 　　　 　　 D. having known

28. I really don’t know _______I kept the secret papers.

A. where was it　 B. it was where that　 C. where it was that　　 D. where was it that

27. ---Why do you look so upset?

---There are so many troublesome problems _____.

A. remaining to be settled 　　B. remained settled

C. remaining to settle　 　　D. remained to be settled

26. The tobacco, which is used to make cigarettes, was first grown in _______ is now part of the United States.

A. what 　　　　　 B. that　　　　 C. all　　 　 D. which

25. It didn’t _____ him that she would refuse his invitation

A. happen to　 B. adjust to　 C. belong to　　　　 D. occur to

24. The young actress looked so charming in her beautiful dress that we took ______ pictures with her.

A. a great many of　 B. masses of　　 　　 C. the number of　　 　 D. a large amount of