The secretary had to stay in her office all day ________ her boss might have something important to be typed．

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• 1He has difficulty with his English; ________, he works hard and is making rapid progress．

  A.and

  B.but

  C.however

  D.yet

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• 2I didn't make great progress in my English study _________ my teacher had given me some advice on how to learn the language well．

  A.unless

  B.before

  C.until

  D.when

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• 3Whoever leaves the room last must make sure ________ all the windows are shut．

  A.that if

  B.whether

  C.if

  D.that

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• 4Study hard, ________ you will make great progress．

  A.and

  B.or

  C.or else

  D.otherwise

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• 5________ one hour in the morning, and you will be looking for it the rest of the day．

  A.Lose

  B.Lost

  C.To lose

  D.Having lost

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• 6Stop making so much noise _________ the neighbors will start complaining．

  A.or

  B.and

  C.so

  D.yet

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• 7Watch your step, ________ you might fall into the water．

  A.or

  B.and

  C.unless

  D.but

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• 8Everyone _________ Tom's brother was able to swim across the river after being trained．

  A.beside

  B.besides

  C.except

  D.and

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• 9I am afraid I won't have any influence over my 19-year-old daughter ________ her mind is made up．

  A.once

  B.the moment

  C.as soon as

  D.since

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• 10My mother couldn't go to school, ________ being poor, the family couldn't pay for his education．

  A.as a result

  B.since

  C.as

  D.for

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