21 . ________evidence that language acquiring ability must be stimulated.

　　A. If being B. It is

　　C. There is D. There being

　　22. Professor Wang , _______ for his informative lectures, was warmly received by his students.

　　A. knowing B. known

　　C. to be known D. having known

　　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

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

　　A. shouldn't follow

　　B. mustn't follow

　　C. couldn't have been following

　　D. shouldn't have been following

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

　　A. does there B. isn't there

　　C. hasn't there D. isn't it

　　26. It is the news ____ most parents of the hope that there is a safe and socially approved road to a kind of life they themselves have not had, but their children can.

　　A. that deprive　 B. that it deprives

　　C. that deprives　 D. when it deprives

　　27. We hadn't met for 20 years, but I recognized her_____ I saw her.

　　A. the moment B. for the moment

　　C. the moment when D. at the moment when

　　28. On hearing a great noise, Mike looked forward through the window _____ what happened outside the room.

　　A. to seeing B. to see

　　C. seeing D. to have seen

　　29. You ______ be driven out of the school if you dare to cheat in the exam.

　　A. should B. would

　　C. will D. shall

　　30. Everyone hopes that we can do something to make things better, so we can't help ______ under the stress.

　　A. but working B. but to work

　　C. work D. but work

　　31. We all think that _____ no need to make laws to prevent the young from getting married during their college life.

　　A. it is B. there has

　　C. it has D. there is

　　32. Postage ___ the necklace will cost you at least 650 yuan.

　　A. including B. included

　　C. include D. to be included

　　33. With his eyes ______ on the family album, he thought of the fun he had when he lived with his parents.

　　A. fixing B. fixed

　　C. to be fixed D. being fixed

　　34. George applied for the position three times ______ he finally got it.

　　A. before B. until

　　C. when D. after

　　35. This robot is supposed to save a lot of labor, but it remains a problem if it ______

　　A. is B. saves

　　C. does D. has

　　36. There were many more people who got injured in the big fire than _______.

　　A. was reported B. it was reported

　　C. were reported D. they were reported

　　37. He doesn't know what to say, for it is the first time that he ______ with a girl.

　　A. went out B. goes out

　　C. has gone out D. had gone out

　　38. ___which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.

　　A. Leaving to wonder B. Having left to wonder

　　C. Left wondering D. Left to wonder

　　39. During the tourist season, there are many people wandering in this city to see the old castles _____ in the sixteenth century.

　　A. to be built B. being built

　　C. having been built D. built

　　40. When do you think ______ start the new attack?

　　A. they will B. will they

　　C. they can D. can they