Mr Smith closed all the windows while driving ______ he wouldn't catch a cold.

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• 1Joanna is no less hardworking than her twin sister, _______ she failed in the final exam.

  A.but

  B.so

  C.or

  D.and

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• 2Baseball requires teamwork _______ tennis is an individual sport.

  A.while

  B.when

  C.yet

  D.although

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• 3Few people paid full attention to their health conditions ________ they were seriously ill.

  A.when

  B.if

  C.until

  D.after

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• 4________ Mrs Smith worked day and night, he found it difficult to make enough money to support such a large family.

  A.Since

  B.If

  C.Once

  D.Although

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• 5---Did you fall in love with that girl _____ you met her? ---Yes. Now we lead a happy life.

  A.for the first time

  B.the first time

  C.first time

  D.by the first time

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• 6Someone called me up in the middle of the night, but he hung up ______ I could answer the phone.

  A.as

  B.since　　

  C.until　　

  D.before

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• 7Experts are trying to work out a plan to deal with the problems caused by global warming ______ it is too late.

  A.when

  B.if

  C.before

  D.until

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• 8_________ advertisements are of great help, I don't think we should entirely rely on them.

  A.Since

  B.While

  C.Because

  D.As

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• 9We won't keep winning games ________ we keep playing well.

  A.because

  B.unless

  C.when

  D.while

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• 10______ you have finished your work, you ought to have a good rest.

  A.For

  B.What if

  C.Even when

  D.Now that

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