1. Usually we dont realize how important nature is to us______ it is too late.
A. unless B. until C. if D. after
2.Go to bed early,______ you wont get up on time next morning.
A.then B.and C.but D.or
3.Tony is a clever boy,______ he usually fails in Chinese exams.
A.so B.but C.or D. because
4. Could you please give me your e-mail address ____ you go?
A. as soon as B. before C. after D. until
5. Dont get off the bus ____ it has stopped .
A. until B. if C. to D. for
6. He met many problems ____ he was going over his lessons .
A. before B. as soon as C. since D. while
7. We have been good friends ____ we joined the same ping-pong team.
A. after B. before C. since D. until
8. My brother is going to look for another job______the company offers him more money.
A. after B.when C unless D.besides
9. I didnt know he came back ____ I met him in the street.
A. since B. when C. until D. after
10. -Look! Here comes our school bus.
-No hurry. Dont get on it ______it has stopped.
A. until B. after C. since D. when
11. When someone is ill, he ____ she should try to smile at life.
A. and B. but C. or D. so
12. Come ____ see my family.
A. and B. or C. but D.until
13. - How long have you known the doctor ?
- ____ he helped me three years ago.
A. When B. Before C. Because D. Since
14. Study hard, ____ youll fall behind the others.
A. and B. but C. or D. though
15.-Be careful, ____ you will make mistakes in your exams.
-I know that,Mum.One can never be too careful.
A.and B.or C.nor D.but
16.I arrived at the airport____ the plane had taken off.
A.after B.while C.when D.beflore
17.Uncle Wang gave all his savings to the Hope School____ he himself was not rich.
A.because B.as if C.though D.or
18. The dress fits me well,____ I dont want to buy it because its too expensive.
A. so B. and C. or D. but
19. English is interesting, _____ I didnt like it at first.
A. and B. so C. but D. or
20. -Would you like to come to dinner tonight?
-I will ________ Im not too busy.
A. and B. if C. so D. but
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6-10 DCCCA
11-15 CADCB
16-20 DCBCB
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