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11. It was difficult for him to buy good shoes because he had such a big ______ of feet.

A. pair

B. size

C. couple

D. number

12. She has to clean all the ______ in all the ______ in two hours. A. furniture…bedroom

B. furnitures…bedrooms

C. furniture…bedrooms

D. furnitures…bedsrooms

13. The number of students who failed the chemistry examination ______to fifteen.

A. have increased

B. has increased

C. is increased

D. are increasing

14. Reading English newspapers ______ a good way of ______ your English.

A. is… improve

B. are…improving

C. is…improving

D. are…improve

15. Three times seven ______twenty-one.

A. have

B. are

C. has

D. is

16. Ten days ______ long enough for Mr. Carter to finish his design. He doesn’t need any more.

A. is

B. has been

C. was

D. had been

17. Twenty miles ______a long way to cover.

A. have been

B. is

C. are

D. were

18. Many a student______ that mistake before.

A. had made

B. has been made

C. have made

D. has made

19. Tom, together with his family, _______ to see us tonight.

A. is coming

B. are coming

C. comes

D. come

20. I came across a ______ on the street yesterday morning.

A. friend of my father’s

B. friend of my father

C. my father’s friend

D. father’s friend