1. In some parts of London, missing a bus means to wait for another hour.

20．- Could you do me a favor and take the box up to the sixth floor?

　　- ________ . No problem at all.

A. With pleasure　　　　　B. My pleasure

C. For pleasure　　　　　 D. At your pleasure

19. The artist made up his mind t devote all he could _________ his English before going abroad.

A improving　　 B to improve　　　　　 C to improving　　　　 D improving

18.　　　 　of the land in that district 　　　　　covered with trees and grass.　

A. Two fifth；is　　　　　　　　　　　　　　　　　 B. Two fifth；are

C .Two fifths；is　　　　　　　　　　　　　　　　　 D. Two fifths；are

17. Only then　　　　 how much damage had been caused

A. did she realize　 B. she realized　 C. had she realized　 D. she had realized

16. As is known to all, oranges are _______ Vitamin C.

A. rich in　　 　 　　　　　 B. poor with　 　　　　　 C. short of 　　　　　　　　 D、good　 for

15. Did you find　　　　　 impossible for him to tell the truth?

A. this　　　　　 B. it　　　　　　 　　 C. that　　　　　　 D. what