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    To make our city more beautiful, rubbish ________ into the river.


    1. A.
      needn't be thrown
    2. B.
      mustn't be thrown
    3. C.
      can't throw
    4. D.
      may not throw

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    ________ to come and meet my family tonight, will you?


    1. A.
      Be sure
    2. B.
      To be sure
    3. C.
      Being sure
    4. D.
      Make sure

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    To my great ______ , he finished the work only in a few days.


    1. A.
      surprised
    2. B.
      surprising
    3. C.
      surprises
    4. D.
      surprise

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    ________ to collect Chinese stamps?


    1. A.
      Did he used
    2. B.
      Does he use
    3. C.
      Did he use
    4. D.
      Does he

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    To invent a new kind of electric light, Thomas Edison did lots of ____.


    1. A.
      research
    2. B.
      inventions
    3. C.
      experiments
    4. D.
      experiences

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