We'd better set off now, or it will be dark ______ we know it.

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• 1— Hurry!There is no time to Waste.     —  Ok. But I'm afraid we'll miss the train ________ we take a taxi.      

  A.when

  B.until

  C.unless

  D.if

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• 2______ you consider that the airline handled 80 million passengers last year, the accident figures are really very small.

  A.As

  B.While

  C.When

  D.For

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• 3But this really is a surprise. It must be ten years _____ we last met in Beijing, isn't it? And now we run into each other in Xiamen.   

  A.since

  B.before

  C.when

  D.that

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• 4—________you like that latest type of car so much,why not buy it?—Well,I can't afford so expensive a car.It is worth 200,000 yuan.

  A.As if

  B.Even if

  C.Now that

  D.In case

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• 5It was over a decade _______ they paid off all their debt. You can imagine what a hard life they had.

  A.before

  B.until

  C.after

  D.while

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• 6— You told Holmes about what happened in the train?  — No,I didn't. He had rushed off towards the station ________ I could say anything more.    

  A.before

  B.until

  C.when

  D.as

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• 7Heavy objects and light objects fall at the same speed ________ air holds them back.

  A.so that

  B.if

  C.unless

  D.although

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• 8_____ you have made a promise, you should carry it out.    

  A.Once

  B.Until

  C.For

  D.While

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• 9A new survey shows that 54 percent of Americans do not take prescription medicines ________ though they are important to their health.

  A.as they instruct

  B.as were instructed

  C.as to be instructed

  D.as instructed

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• 10His father got him a job in a bank but soon it became clear ________ he was not fit for that kind of work.

  A.why

  B.what

  C.whether

  D.that

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