25. Astronauts in a spaceship have to _______weightless conditions _______are quite different from ______are on the earth.　

　　 A. do with; which; those　 　　　　　　　B. deal with; that; that　

C. solve; that; what 　　　　　　　　　　D. face; which; these

24. - Can you answer my question?

　 --Sorry, I____________ . Would you repeat that question?

　　 A. hadn't listened　　　 B. haven't listened　 　C. don't listen　　 D. wasn't listening

23. Mary has lived in China for 3 years, so she ______ to the life here.

A. used　 B. has got used　 C. was used　　 D. got used

22. There was plenty of time. She ________ . A. mustn't have hurried　 B. couldn't have hurried　 C. must not hurry　 D. needn't have hurried

21. -----________ he be watching TV now? ------Yes, he ________ be watching TV now. 　A. Must, can　　　　　　 B. Can ,must　　　　　　 C. Can, can　　　　　　 D. May, must

20．Have you　considered　the　students’ request _________ the school library _______ more books on popular science?

A. that　; provide 　　　　　　B. when ; provided　　

C. which　; should provide　　 D. where; would provide

19．A person ______ e-mail account is full won’t be able to send or receive any e-mails.

A. who　 　　B. whom　　 　　　　　C. whose　 　　　　　D. whoever