22、――Did you see Grace in the teacher’s office？

  ――Yes, she ______to him why she didn’t hand in her assignments

  A. is explaining     B. was explaining    C. had explained     D. explained

21、------Sorry to have hurt you

   ------- ?? . You didn’t mean to, did you?

    A. Forget it                 B. No problem          C.All right       D. Don’t say so

20、Hearing the 2008 Olympic Games  ?? , all the people in Beijing stadium burst into cheers.

    A.declared to be opened                B.declaring to be opened

    C.declared open                      D.to be declared open

19、

----What do you think has caused the fearful hurricane in American?

-----       out too much warm gas

   A. People cut forest at will and let

   B. Because people cut forest at will and let

   C.When people cut forest at will and let

   D.People’s cutting forest at will and letting

18、----What do you think has caused the fearful hurricane in American?

-----  out too much warm gas

   A. People cut forest at will and let

   B. Because people cut forest at will and let

   C.When people cut forest at will and let

   D.People’s cutting forest at will and letting

17、 If you keep practicing your son in football, he ____ to be a famous player .
　 A. wants　　　 B. hopes       C. wishes　　　　D. promises

16、The professor can hardly find sufficient grounds?? his argument in favor of the theory.

   A. which to base on                       B. on which to base

   C. to base on which                       D. which to be based

15、Beijing was attacked by such a terrible sandstorm ?? few residents had experienced before

   A. as        B. which             C. and it was           D. that

14、I ??  them when the accident happened, but I ?? how to give first aid.

  A. could help; know                    B. could help; didn’t know

  C.could have helped; hadn’t known        D.could have helped; don’t know.

13、---Why didn’t Tom have his lunch? It’s already one o’clock.

  ---His pet bird ?? this morning. He?? still for quite a long time in his room crying.

  A. died; had sat                           B. has died; has sat     

  C. has died;is sitting                       D.died; has been sitting