20. _______ I haven’t heard from her yet.

　　　 A. So long　　 B. Before long　　 C. By then　　 D. So far

19. The teacher tried to make the exam _____ for us to do .

　　　 A. easy　　 B. easily　　　 C. difficulty　　　 D. hardly

18. Is this factory _____ some foreign friends are coming to visit next week?

　　 　A. the one　　 B. the one what　　　 C. there　　　 D. that

17. The teaching building _____ ever since.

A. has been added　　 B. has been added to　　

C. was added up　　　 D. had added up

16. The old woman has two daughters, _____ are college students now.

　　　 A. all of whom　 B. each of them　 C. both of them　　 D. both of whom

15. I hate ____ when people talk with their mouths full.

　　　 A. it　　 B. that　 C. these　　 D. them

14. The visiting Minister expressed his satisfaction with his talks, ____ that he had enjoyed his stay here.

　　 A. having added　 　　B. to add　　 C. adding　　 D. added

13. Nothing can stop the experiment _____.

　 A. being made　　 B. from doing　　 C. from making　 D. carrying out

12.Everyone has a comfortable chair _____.

　 A. to sit　　 B. to sit on　　 C. sat　　　 　D. sit

11．When the thief reached the station, he was caught in ____ public by the police.

　 A. a　　 B. the　　 c. an　　　 D. /