20. Was it _____ she heard with her ears _____ really made her frightened？

A. what；that 　　B. it；that 　　C. that；which 　　D. what；／

19. Is this factory _____ you visited the other day？

A. the one 　　B. that 　　C. where 　　D. when

18. I have nothing to confess. ____ you want me to say?

A. What is it that　 B. What it is what　 C. How is it that　 D. How it is that

17.--- ____ was it ____ they discovered the entrance to the underground palace?

--- Totally by chance.

A. What, that　　 B. How, that　 　　C. When, how　　 D. Where, that

16. Never _____ time come back again.

A. has lost　　 B. will lose　　 C. will lost　　 D. lose

15. Can _____ be in the desk _____ you have put my letter？

A. it；which 　　B.I；Where 　　C. you；in which 　　D. it；that

14. Time should be made good use of ____ our lessons well.

　 A. learning 　　B. learned 　　C. to learn 　　D. having learned

13. Even though he has lived in China for many years, Mark still can not _______ himself to the Chinese customs.

A. adopt 　　　　B. account 　C. adapt 　　　　D. accept