A composer writes a work, but no one can hear it ________ it is performed．

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• 1The price of gold still remains at high, _________ it saw some downturn recently．

  A.as long as

  B.however

  C.even though

  D.as though

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• 2You must work out the problem all by yourself, ________ it is very difficult．

  A.as if

  B.even

  C.but

  D.even though

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• 3It is well-known that atmosphere gets thinner and thinner ________ the height increases．

  A.while

  B.when

  C.as

  D.with

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• 4His humorous closing speech was a welcome addition to the ________ dull meeting．

  A.therefore

  B.meanwhile

  C.otherwise

  D.nevertheless

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• 5It took several decades ________ this once poor village became one of the richest in the country．

  A.when

  B.unless

  C.for

  D.before

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• 6We should be conscious of our shortcomings _______ we make great mistakes．

  A.in case of

  B.unless

  C.in case

  D.while

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• 7________ China's reform and opening up in late 1978, its quick development has aroused worldwide attention．

  A.When

  B.As

  C.While

  D.Since

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• 8It was one month ________ the mother got the news of her son's safety．

  A.until

  B.when

  C.since

  D.before

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• 9There were days when I wished that I were dead __________________ I wouldn't feel so sick in the world．

  A.so that

  B.even if

  C.as if

  D.except that

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• 10Many people believe we will suffer from more environmental disasters ________ we change the way we live．

  A.but

  B.although

  C.so

  D.unless

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