1. Usually we don't 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 won't 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. Don't 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 didn't 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. Don't 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, ____ you'll 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 don't want to buy it because it's too expensive.
A. so B. and C. or D. but
19. English is interesting, _____ I didn't like it at first.
A. and B. so C. but D. or
20. -Would you like to come to dinner tonight?
-I will ________ I'm not too busy.
A. and B. if C. so D. but
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