________you never plan to visit the polar bears in the North Pole or the penguins in the South Pole，now it is the proper time to start thinking about that.

试卷相关题目

• 1 We had just covered half the journey________the engine failed and we could do nothing but wait for help.

  A.before

  B.since

  C.when　

  D.until

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• 2  Some people are worrying about the possibility _______ mobile phones could be responsible for a range of illnesses, from rashes (皮疹) to brain tumors.

  A.that

  B.why

  C.how

  D.whether

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• 3_________ there are certainly times when giving up trying is the right thing to do, in most cases all needed is commitment and communication.

  A.Unless

  B.Before

  C.Although

  D.Since

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• 4It is by no means clear ________ the president can do something to end the strike.

  A.whether

  B.which

  C.that

  D.what

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• 5It is announced that big prizes will go to ________ finishes the assignment on time.

  A.whom

  B.who

  C.whomever

  D.whoever

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• 6____ I'm mistaken, I've seen that tall man at a party before.

  A.If

  B.As

  C.Unless

  D.When

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• 7Suddenly the idea came to me _______ I might turn to my teacher for help.

  A.what

  B.that

  C.which

  D.whom

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• 8The relatives of the passengers in the missing Flight MH370 can't hide their feelings, _____ they can make sure that the plane will make a safe landing on the airport.

  A.except when

  B.except

  C.except that

  D.except where

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• 9 _______ is more important is _______ as the earth cooled down, water began to appear on its surface.

  A.What /that

  B.That/what

  C.What / what

  D.That / that

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• 10As a green hand, he doesn't know______ it takes to start a business here.

  A.when

  B.how

  C.what

  D.which

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