Just as no two words are truly synonoyms， _____ no two different expressions，or ways of expressions，can mean exactly the same thing.

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• 1By the time you arrive home，I _____ for several hours，so please don't make a noise when you come in.

  A.shall be sleeping

  B.shall have slept

  C.shall sleep

  D.shall have been sleeping

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• 2No two people can be half an hour together _____ one shall gain an evident superiority over the other.

  A.but

  B.when

  C.if

  D.because

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• 3They must have been enjoying themselves there，or they _____ so long.

  A.can't have stayed

  B.wouldn't have stayed

  C.needn't have stayed

  D.couldn't stay

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• 4One should never lose one's heart when _____ with temporary difficulties.

  A.being confronted

  B.confronted

  C.having been confronted

  D.confronting

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• 5Rather than _____ everything to the last minute，he always prefers to start early.

  A.leave

  B.to leave

  C.leaving

  D.leaves

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• 6_____ about one million years ago，the fossil record shows an accelerating growth of human brain.

  A.Starting

  B.Having started

  C.Having been started

  D.Being started

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• 7Public goods are those commodities _____ enjoyment nobody can be effectively excluded.

  A.in which

  B.whose

  C.from whose

  D.in whose

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• 8Only when the process of meeting the basic need for food reached a certain level of sophistication _____ to follow other pursuits.

  A.it was possible for humans

  B.was it possible for humans

  C.were humans possible

  D.possible for humans it was

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