28. The police _____ searching for a tall dark man with long hair.

A. is　　　 B. has been　　　 C. are　　　 D. had been

27. Every means ______ tried to improve teaching and learning.

A. has　　　 B. has been　　 C. have　　　 D. were

26. An iron works ______ now.

A. is being built　 B. are being built　 C. has built　 D. has been built

25. His physics ______ weak. A. is　 B. seem　 C. was　 D. are

24. Mathematics(数学) _____ a very important subject.

A. are　　 B. is　　 C. were　　 D. was

23. The New York Times ______ a wide circulation(发行额).

A. is　　　 B. has　　　 C. are　　　　 D. have

22. The Arabian Nights ______ a very interesting storybook.

A. is　　　 B. are　　　 C. has been　　 D. had been

21. The United Nations ______ a resolution.

A. has past　 B. has passed 　C. have passed 　D. has through

20. Twenty dollars _____ what he needs.

A. was　　 　B. were　 　　C. is　 　　D. has been

19. There _____ in my class. Which of them do you want to see?

A. is John　 B. are three Johns　 C. are the John’s　 　D. is the John