19. This is the second time I ______ here.

　 A. was　　　　　 B. have been　　　 C. came　　　 D. am coming

18. I’m sorry, young man. We don’t find anything ______ in your information.

　 A. of valuable　　　 B. of value　　 C. of values　　　　 D great valuable

17. Will you drop in at my house this afternoon if ________?

　 A. it is convenient for you　　　　 B.　 you are convenient

　 C. it is convenient of you　　　　　 D. you will be convenient

16. A nest is to a bird ______ a house is to a man.

　 A. where　　　 B. how　　　　　　 C. what　　　　 D. when

15. He has got himself into a dangerous situation _______ he is likely to lose control over the plane.

　 A. where　　　　 B. which　　　　 C. while　　　 D. why

14. The research is so designed that once ______ nothing can be done to change it.

　　　 A. begins　　　　　　　　　　 B. having begun　 C. beginning　　　　　　　 D. begun

13. In general， the old man is generous. But ____, he was mean to an old beggar.

　　　 A. at once　　　　　　　　　　 B. once again　　　 C. for once　　　　　　　　 D. once over

12．Was it at the school ______ was named after a heroine _______he spent his childhood ?

　　　 A．which, that　　　　　 B. where ,which　 C．where ,that　　　　　 D．there ,that

11. The old man, ______ his bag in the street, couldn’t do anything but ____ the police for help.

　　　 A. robbed ; to ask　　　 B. robbed of; ask　　　　　　　　　　　　　　　　　 C. robbing; ask　　 D. robbing; to ask

10. I wonder what’s your attitude ______ the problem _______ now.

　　　 A. in; discussing　　　　　　　　　　　　　　　　　　　 B. with; to be discussed

　　　 C. towards; discussed　　　　　　　　　　　　　　 D. to; being discussed