21.---I’d like to invite you to dinner this Saturday.　

---__________________.

A.　　 Oh, let’s not.　　　　　　　　 B. I’m very sorry, but I have other plans.　

C.　　　 I’d rather stay at home.　　　　 D. Oh, no. That will be too much trouble.

20._____ for a long time, most of the crops in this area died from lacking water. 　 　A. Being no rain　　 B. There was no rain　 C. To be no rain　　D. There being no rain

19.Helen had to shout _____ above the sound of music. A. making herself hear　　 B. to make herself hear C. making herself heard　　 D. to make herself heard

18.It was ______ yesterday that ____ our nation has won 63 gold medals.

A. not until; did I learn B. until; that I learned　 C. not until; when I learned D. not until; I learned

17.The two boys started to fight and an old man tried to ____ them. A. separate　　 B. divide　　 C. seize　　 D. share

16.---Well done and congratulations on your success. --________. A. Good idea.　 B. Thanks very much.　 C. The more the better　 D. You’re welcome.

15.Bison(野牛)is a type of wild animal which used to exist _______ huge numbers____ the plains (草原) of America.

　 A. in, in　　　 B. with, on　　　　 C. in, on　　　　 D. at, in

14.The policemen talked about the necessary actions that they would like to see _________ the next year.

　 A. take　　 B. to take　　 C. taking　　　 D. taken

13.--- How did you find the newly-published 21^st Century School Edition?

　 ---___________.

　 A. In the newspaper　　　 B. More than great　　 C. On TV　　 D. Greatly

12.---Have the students started to do the experiment?

　 ---Yes, it _______________.

　 A. was done　　 B. was doing　　　 C. is being done　　 D. is to be done