24. __________ she couldn't understand was__________ fewer and fewer students showed interest in her lessons.

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

23. People greatly__________ in their views of life.

A. lead　　 　　　　B. differ　　　 　　C. bring　　　 　　D. struggle

22. You look so tired tonight. It is high time you_________.

A. went to bed　　 B. went to sleep　　 C. go to bed　　 D. to sleep

21. --I don't think we have met before.

--Yes, once at a party, but we___________.

A. weren't introduced　　　　　　 B. didn't introduce

C. haven't introduced　　　　　　 D. were not introducing

20. Our new house is very___________ for me as I can get to the office in five minutes

A. convenient　　 B. comfortable　　 C. natural　 D. helpful

19. --I can't find Mr. Smith.

--It was in the hotel___________ he stayed.

A. that　　　　 　　B. where　　　　 C. which　　 　D. since

18. Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.

A. since　　　　　 B. before　　 　　C. after　　 D. when

17. My uncle___________ until he was forty-five.

A. married　　　　　　　　　　　 B. didn’t marry

C. was not marrying　　　　　　 D. would marry

16. --What when I phoned you?

A. had you done; finished　　　　

B. were you doing; had just finished

C. did you do; had just finished

D. were you doing; was finishing

15. Sometimes words alone were not enough to _________pupils along the path of knowledge

A. provide　　　 B. persuade　　 C. advise　　　　 D. cause