You can't borrow books from the school library _____ you get your student card.

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• 1I don't know why she's looking at me _____ she knew me. I've never seen her before in my life.

  A.as

  B.although

  C.as if

  D.even if

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• 2— Did you return Fred's call? — I didn't need to _____ I'll see him tomorrow.

  A.though

  B.unless

  C.when

  D.because

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• 3— I wonder how much you charge for your services. — The first two are free _____ the third costs $30.

  A.while

  B.until

  C.when

  D.before

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• 4Experts are trying to work out a solution to save the miners _____ its too late.

  A.before

  B.since

  C.unless

  D.when

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• 5The landslide almost flattened the small town of Zhouqu, leaving 1,248 dead and 496 missing. I wonder how long it will be ____ the people there get over the shock.

  A.before

  B.when

  C.since

  D.after

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• 6If you are able to talk to a friend over the telephone, you feel that you are close _____ the actual distance is not shortened.

  A.so long as

  B.if

  C.even if

  D.as

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• 7—Have you known each other for a long time? —Not very, ______ we started to study in this middle school.

  A.when

  B.since

  C.after

  D.before

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• 8I didn't manage to work out the problem _____ the teacher had explained how.

  A.until

  B.unless

  C.when

  D.before

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• 9We had to wait half an hour _____ we had already booked a table.

  A.since

  B.although

  C.until

  D.before

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• 10He made a mistake, but then he corrected the situation _____ it got worse.

  A.until

  B.when

  C.before

  D.as

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