31. We have made _____ a rule _____ in the office.

　A. this; not to smoke　 B. it; smoking　 C. it; to not smoke　　 D. it; not to smoke

30. Whether the wounded _____　 sent to the hospital without delay　 ______ unknown yet.

　A. have been; is　 B. has been; is　 C. were; are　　 D. have; is

29. It is generally considered unwise to give a child ______ he or she wants.

　A. however　 B. whatever　　 C. whichever　　 D. whenever

28. E-mail, as well as telephones, _____ an important part in daily communication.

　A. is playing　　 B. have played　 C. are playing　　 D. play

27. Jane’s summer vacation in England led to _____ an Englishman.

　A. her marry　　 B. her to marry　 C. her being married　　 D. her marrying

26. It is no use ______ without thorough (彻底的)_________.

　A. to read ; understood　　 B. reading; understanding

　C. to read; understand　　 D. read; to understand

25. They’ve produced ______ as they did last year.

　A. as twice many tractors　　 B. twice as many tractors

　C. many tractors as twice　　 D. as many tractors twice

24. – Is that book worth______?　 -- Yes, it is worthy ______ twice.

　A. reading; being read　　 B. to read; to be read

C. of being read; reading　　 D. reading; of being read

23. Only when your identity has been checked, ______.

　A. you are allowed in　 B. you will be allowed in

　C. you will allow in　 D. will you be allowed in

22. The villagers were almost completely _____ from the outside world after a heavy snow.

　A. cut out　　 B. cut off　 C. cut up　　 D. cut through