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1. Usually we dont realize how important nature is to us______ it is too late. A. unless B. until C. ifD. after 2．Go to bed early，______ you wont get up on time next morning. A．thenB．andC．but D．or 3．Tony is a clever boy，______ he usually fails in Chinese exams. A．soB．butC．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. untilB. ifC. toD. for 6. He met many problems ____ he was going over his lessons . A. before B. as soon asC. sinceD. while 7. We have been good friends ____ we joined the same ping-pong team. A. afterB. before C. since D. until 8. My brother is going to look for another job______the company offers him more money． A. afterB.when C unless D．besides 9. I didnt know he came back ____ I met him in the street. A. since B. whenC. until D. after 10. -Look! Here comes our school bus. -No hurry. Dont get on it ______it has stopped. A. until B. afterC. since D. when | 
