21.－Why are you looking so disappointed, Ken?

　－The outdoor concert _____for tomorrow will be put off.

　 A. planned　　 B. planning　 C. plan　　 D. to be planned

20.－Goodbye! Nice _______ you!　 －_______,too!

　 A. to meet ; I　 B. to have met ; Me　 C. to meet; Me　 D. meeting; I

19.He is rather difficult to make friends with, but the friendship of his, ______ is truer than that of anybody else’s.

　 A. once gained　　 B. while gaining　　 C. if gain　 D. after gained

18.The man we followed suddenly stopped and looked as if______ whether he was going in the right direction.

A. seeing　　 B. having seen　　 C. to see　 D. to have seen

17.Pleasant as they made it_____, we felt tired after the long journey.

A. to travel　　 B. travel　　 C. traveled　 D. traveling

16.If you go to Xi’an，you’1l find the palaces there more magnificent than commonly　　 ．

　 A．supposing　　 B．supposed　　 C．to suppose　　 D．suppose

14.　 On a 　　 　　　morning the little girl was found 　　　　 　　at the corner of the street. A. freezing, freezing　　　　B. freezing, frozen　　　　　 C. frozen, frozen　　　　　　D. frozen, freezing 15.　　　 to nuclear radiation, even for a short time, may produce variants (变异体) of genes　 in human bodies.

　 A. Being exposed　　　 B. Having exposed　 C. Exposed　　　 D. After being exposed

13. He dressed himself quickly and 　__________　his schoolbag, went to school. A. carried　　　　　　　　　B. to carry　　　　　　 C. carrying　　　　　　 D. carries

12. Although punctual himself, the professor was quite used 　　_______　late for his lecture. A. to have students　　　 B. for students to be C. for students’ being　　　D. to students’ being

11.　He was so foolish 　_______ 　his car unlocked. 　　　A. to leave　　　　　　 B. that leave　　　　　 C. as to leave　　　　 D. for him to leave