You should inspect the wheels regularly, and replace them ______ they cause you trouble.

试卷相关题目

• 1The term “weak eyesight” is misleading, _______ in near-sighted eyes the lens(水晶体) of the eye is actually too strong.

  A.though

  B.for

  C.so

  D.unless

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• 2It is not always easy for the public to see _______ use a new invention can be of to human life.

  A.whose

  B.which

  C.that

  D.what

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• 3We won't give up ______________we should fail ten times.

  A.even if

  B.since

  C.whether

  D.until

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• 4The government has taken some measures to solve the shortage of electricity, but it may be some time ____________ the situation improves.

  A.since

  B.when

  C.unless

  D.before

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• 5_________ we have realized the danger of over-consumption, some measures should be adopted as soon as possible.

  A.Now that

  B.As long as

  C.In order that

  D.Even if

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