16. They stood in the rain for two hours, but they ________for Mr. Ying, because he didn't come at all.

　　A mustn't have waited B may not have waited

　　C can't have waited D needn't have waited

　　17. The girl ____________ left him a few weeks ago.

　　A he fell in love with B whom he fell in love

　　C that he fell in love D with who he fell in love

　　18. ____________ I arrived in South Africa, I was struck by the very great difference in the atmosphere of the country.

　　A Since the moment B During the time

　　C By that time D From the moment

　　19. An object remains still or in a straight line motion _____a force acts upon it.

　　A unless B because C when D if

　　20. There was a good harvest last year, ____________, rice was rather cheap.

　　A furthermore B therefore C but D however

　　21. Such problems ____________ air and water pollution have no limited boundaries.

　　A like B about C as D like

　　22. Tom ____________ the manager this afternoon, but he forgot.

　　A should have telephoned B could telephone

　　C must have telephoned D might telephone

　　23. Either the plant or the flowers will lose ____________ freshness.

　　A his B its C theirs D their

　　24. New medicines are usually tested on animals _______ being tried on human beings.

　　A after B before C for D when

　　25. Mr. Johnson suggested ____________ before details are discussed.

　　A not to draw a conclusion B should not draw a conclusion

　　C to draw not a conclusion D not drawing a conclusion

　　26. The host had no sooner opened the door ________he saw a dark figure behind it.

　　A before B after C when D than

　　27. No machines ________have been invented by man are perfect enough to bring about

　　only advantages to us.

　　A that B than C since D which

　　28. The woman admitted, after being questioned for several hours, __________someone

　　else's credit card.

　　A to use B having used C to have used D uses

　　29. We often do not get the cooperation we want because we believe that cooperation is given rather than ____________ .

　　A earned B to be earned C to be earning D earning

　　30. The reason why he sends her a gift immediately is ____________ if he doesn't.

　　A because she will have disappointed B that she will be disappointed

　　C because she will be disappointed D that she will disappoint

　　答案;

　　1-5 C A B A D 6-10 C D D B C

　　11-15 C C B D A 16-20 D A D A B

　　21-25 C A D B D 26-30 D A B A B