A. 20 percents B. 20 percent C. the 20 percent D. the 20 percents

12. It's about__ , the thickness of a human hair.

A. two-fifteenth B. two-fifteenths C. two fifteen D. two fifteens

13. The price of such material was reduced__ .

A. by 18 percent B. to 18 percent C. at 18 percent D. for 18 percent

14. South of the equator, 81 percent of the surface of the earth__ water.

A. is B. are C. was D. were

15. They sold __boxes of such sweets last week.

A. four dozen B. four dozens C. four dozens of D. four dozen of

16. It took me __ days to finish drawing a beautiful horse.

A. a half dozen B. half a dozen C. haft dozens D. half dozen

17.__people were sent there to help fight against the flood.

A. Three scores of B. Three score of C. Three score D. Three scores

18. Don't leave you work,__ .

A. done half B. half done C. a half done D. done a half

19. Nobody can do two things well __ .

A. at one time B. at once C. one time D. once

20. He has__ books in his study.

A. several thousands B. some thousands of C. some thousands D. some thousand of

21. On National day__ people take part in all kinds of celebration.

A. hundreds of millions of B. millions of hundred of

C. hundreds millions of D. millions hundreds of

22. He has lived at__ for 30 years.

A. No. 101 Heping Street B. 101 Heping Street C. Heping Street 101 D. Heping street No. 101

23. You can find him in__ .

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