30. He is one of the students __________ been to Japan.

　 A. who has　　 B. that　　 C. who have　　 D. that has never

29. ------I ___________ this morning, but he could not come.

------ Well, we’d better go and ________ at his office.

A. called him; call on him　　　　 B. called on him; call him

C. called at him; call　　　　　　 D. called him; call at him.

28. We are old friends. We _______ 　each other for ten years.

　 A. have recognized　　 B. recognized 　　C. have known　　 D. know

27. We should do as much as we can __________ our country better and more beautiful.

　 A. make　　　 B. makes　　　 C. making　　　 D. to make

26. Tom has been reading all day. We_________ tell him to have a rest.

　 A. could　 B. has got to　　 C. has to　　　 D. must

25. Don’t __________by his promises.

　 A. take in　 B. take off 　　C. be taken in　　 D. take after