He knew that cholera would never be controlled _____ its cause was found.

试卷相关题目

• 1Bungee jumping is an exciting activity, very popular among young adults, ___________ courage matters more than strength.  

  A.whose

  B.that

  C.of which

  D.where

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• 2_______these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.

  A.Since

  B.Unless

  C.Once

  D.While

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• 3It was not long _____ he was born that his mother died of illness.

  A.before

  B.when

  C.that

  D.after

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• 4Let's have a talk over this matter this afternoon, or ______ it is convenient to you.

  A.wherever

  B.whichever

  C.however

  D.whenever

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• 5You must set off at once, ______you would be late for school.     

  A.then

  B.and

  C.otherwise

  D.so

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• 6Reality is not the way you wish things to be, nor the way they appear to be, _________ the way they actually are.

  A.as

  B.or

  C.but

  D.and

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• 7________ the boss has arrived, let's begin our discussion right away.

  A.If

  B.When

  C.Now that

  D.Even if

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• 8The athlete seldom wears anything other than sportswear ______the season is.

  A.wherever

  B.whenever

  C.however

  D.whatever

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• 9______ a bad habit is formed, it will take a long time to get rid of it．

  A.Ever since

  B.While

  C.Once

  D.Even if

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• 10_______ you sit in front of the computer all day while working, you'd better take exercise for at least an hour every day.

  A.Even if

  B.Even though

  C.Now that

  D.As if

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