The fact has worried many scientists ________the earth is becoming warmer and warmer these years.

试卷相关题目

• 1I don't understand how he can say that everything is fine ________ it's so obvious that it's not.

  A.unless

  B.when

  C.so that

  D.in case

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• 2When the elevator doors open, stand aside and let everyone out ________ you try to get in.

  A.unless

  B.although

  C.until

  D.before

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• 3—May I go out tonight? —Of course you can, _____ you promise to be back before 10 o'clock.

  A.as soon as

  B.as well

  C.as long as

  D.as usual

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• 4--- Did your father come back early last night? --- Yes. It was not yet eight o'clock _______ he arrived home.

  A.before

  B.when

  C.that

  D.until

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• 5Most disaster experts believe there is the potential ______ things could get a lot worse.

  A.what

  B.where

  C.which

  D.that

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• 6_________ there's the slightest chance that the baby can come to life, the mother will never stop taking care of it.

  A.As well as

  B.As long as

  C.As though

  D.As soon as

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• 7She says that she'll have to close the shop ________ business improves.

  A.if

  B.unless

  C.after

  D.when

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• 8________ he made up his mind, nothing could change it.

  A.Before

  B.Unless

  C.When

  D.Once

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• 9No government can justly claim authority ______ it is based on the will of the people．

  A.unless

  B.after

  C.so that

  D.while

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• 10John thinks it won't be long __________ he is ready for his new job.

  A.when

  B.after

  C.before

  D.since

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