31. Several weeks had gone by ______I realized the painting, was missing.　 ( 04 )

　　A. as　　　　　　　　　　　　 B. before　　　　　　　 C. since　　　　　　　　 D. when

30. __________　I accept that he is not perfect, I do actually like the person. ( 04 江苏 ) A. While　　　　　　　　 B. Since　　　　　　　　 C. Before　　　　　　　 D. Unless

29. You can eat food free in my restaurant　________ you like.　 ( 04 重庆 )

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

28. _____ you call me to say you' re not coming, I'll see you at the theatre. ( 04 四川 )

A. Though　　　　 B. Whether　　　　 C. Until　　　　　 D. Unless

27. We were told that we should follow the main road　______　 we reached the central railway station . ( 04 辽宁 ) 　A. whenever　　　　 B. until　　　　　　　　　 C. while　　　　　　　　 D. wherever

26. _______ I can see, there is only one possible way to keep away from the danger. ( 04 北京春季 )

A. As long as　　　　 B. As far as 　　　　　 C. Just as 　　　　　　 D. Even if

25. We were swimming in the lake ______ suddenly the storm started. ( 04 北京春季 )

A. when　　　　　　　　 B. while　　　　　　　　 C. until　　　　　　　　　 D. before

24. _____ modeling business is by no means easy to get into, the good model will always be in demand.　 ( 04 浙江 ) 　A. While　　　　　　　 B. Since　　　　　　　　 C. As　　　　　　　　　　 D. If

23. It was evening _______ we reached the little town of Winchester . 　A. that　　　　　　　　　　　　 B. until　　　　　　　　　 C. since　　　　　　　　 D. before

22. You should try to get a good night’s sleep　__　much work you have to do . ( 04 湖北 ) 　A. however　　　　　　　　　 B. no matter　　　　　 C. although　　　　　　 D. whatever