18. many workers were organized to clear away

______remained of the world trade center.

a. those

b. that

c. what

d. where

c 该题空格处缺少的是连词，且在从句中作主语，所以排除a,d;

that在名词性从句中只起连接作用。

19. my train arrive in new york at eight oclock tonight. the

plane i would like to take from there ______by then.

a. would leave

b. will have left

c. has left

d. had left

b

20. the professor could hardly find sufficient grounds

_____his arguments in favor of the new theory.

a. to be based on

b. to base on

c. which to base on

d. on

which to base

d on which to bas

e his arguments in favor o

f the new theory = the professor will base his

arguments in favor of the new theory on sufficient grounds.

21 . ________evidence that language acquiring ability must be stimulated.

a. if being

b. it is

c. there is

d. there being

c句中有连词that和谓语must be stimulated，缺少一个谓语动词，排除a,d，该句译成汉语是有。。。的证据,而不是它是。。。的证据所以排除b

22. professor wang , _______ for his informative lectures,was warmly received by his students.

a. knowing

b. known

c. to be known

d. having known

b

23.in fact peter would rather have left for san francisco than

____ in new york.

a. to stay

b. stayed

c. stay

d. having stayed

c

24.you ____ him so closely;you should have kept your distance.

a. shouldnt follow

b. mustnt follow

c. couldnt have been following

d. shouldnt have been following

d

25.there has been a great increase in retail sales , ____﹖

a. does there

b. isnt there

c. hasnt there

d. isnt it

c