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

21. Scientists say it may be five or six years _____　it is possible to test this medicine on human patients. (04福建)

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

20. _____________ I know the money is safe, I shall not worry about it.　 (03 北京 )

　 A. Even though　　　　　 B. Unless　　　　　　　 C. While　　　　　　　　 D. As long as

19. He made a mistake, but then he corrected the situation ____________ it got worse.　 (03 北京 )

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

18. - Was his father very strict with him when he was at school?

　 - Yes. He has never praised him _______ he became one of the top students in his grade.　 (03 北京春季)　 A. after　　　　　 　　 B. unless　　　　　　　 C. until　　　　　　　　　 D. when