______life began on the earth is one of the biggest puzzles to scientists.

试卷相关题目

• 1There was no doubt ____ it was in the supermarket _____ I lost my wallet yesterday.

  A.whether, whether

  B.that, that

  C.that, whether

  D.whether, that

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• 2It was difficult for her to make an immediate decision as it would affect her present job and her relationship with the manager ________.

  A.either

  B.though

  C.meanwhile

  D.as well

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• 3______ some teenagers don't realize is _______ difficult life can be after they get addicted to drugs．

  A.What, how

  B.That, how

  C.What, what a

  D.That, what

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• 4In hot weather, an old tyre can break again easily _____it's mended．

  A.when

  B.where

  C.which

  D.that

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• 5He will spend six hours at his desk _______ he finishes his composition.

  A.before

  B.until

  C.after

  D.when

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• 6I decided to write about Chaplin, one of ______ films I had seen several years before.

  A.whose

  B.whom

  C.that

  D.which

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• 7______practice makes perfect is true.

  A.What;

  B.That

  C.Which

  D.If

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• 8How long do you think it will be ________ China becomes a rich and harmonious country?

  A.before

  B.after

  C.since

  D.when

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• 9It is the ability to do the job _____ matters not where you come from or what you are.

  A.one　　　　

  B.that

  C.what

  D.It

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• 10The report shows that we're making some progress but ______ we need to make greater efforts.

  A.that

  B.whether

  C.what

  D.why

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