15. Work hard, 　　　　you’ll catch up with the others.

　 A. and　　　 B. but　　　　 C. or　　　　　 D. for

14. Be quick 　　　　you’ll be late for the football match.

　 A. so　　　　 B. but　　　　 C. or　　 　　　D. and

13. In spring, it will warmer and warmer, 　　　　more and more trees are turning green.

　 A. for　　　 B. because　　　 C. since　　　 D. while

12. There is only one cake here, so 　　　　you 　　　　he can take it.

　 A. not only, but also　 B. either, or　　 C. both, or　　 D. both, and

11. The homework must be finished at two o’clock, 　　　　you may go out to play.

　 A. when　　　　 B. before　　　 C. then　　　　　 D. than

10. I think it can be 　　　　played 　　　　eaten. You’d better throw it away.

　 A. both, and　　 B. either, or　　 C. neither, nor　　　 D. not only, but also

9. Don’t 　get off 　　　　　the bus stops.

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

8.　　　 We won’t go back home________ we find the owner if the handbag.

　A. because　　　　 B. after　　　　 C. when　　　　 D. until

7.　　　 Though we students have _______money _______time, we try our best to help them.

　A. both, and　　　 B. neither, nor　　　 C. either, or　　 D. not , but

6.　　　 ---I can hardly decide ________ computer to buy. ---Let’s go and ask the shop assistant for help.

　A. whether　　 B. which　　　 C. that　　　　 D. if