13. 　　there is a snowstorm or some other bad weather, the mail always comes on time. (上海春)

　　 A．Because 　　　　　　 B．If　　　　　　　 C．When　　　　　　　　　　 　 D．Unless

12. He was told that it would be at least three more months ___________he could recover and retum to work. (江西卷)

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

11. Most birds find it safe to sleep in the trees, but ________ they have eggs or young chicks, they don’t use a nest. (湖南卷)

　 A. why　　　　　 B. how　　　　　　　 C. unless　　　　　 D. where

10. You will be successful in the interview 　　　　　　you have confidence. (福建卷)

A. before　　 　　 B. once　　　　　　　　　　　　 　　 C. until　　　　　 　　 D. though

9.-Where’s that report?

　 -I brought it to you ____you were in Mr. Black’s office yesterday. (北京卷)

A. if　　　　　　　 B. when　　　　　　 C. because　　　　　 D. before

8. Leave your key with a neighbor ___　 you lock yourself out one day(北京卷)

A. ever since　　　　 B. even if　　　　　 C. soon after　　　　 D. in case

7. The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again. (安徽卷)

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

6. ________ I really don’t like art, I find his work impressive. (山东卷)

A．As　　　　　　 B．Since　　　　　 C．If　　　　　　　 D．While

5. Small sailboats can easily turn over in the water ______ they are not managed carefully. (上海卷)

　 A. though　　　　　　　　　　 B. before　　　　　　　　 C. until　　　　　　　　　 　 D. if

4. Pop music is such an important part of society ______ it has even influenced our language. (上海卷)

　 A. as　　　　　　　　　　　　　 B. that　　　　　 C. which　　　　　 　　 D. where