This substance ________ a gas when heated .


  1. A.
    gives in
  2. B.
    gives out
  3. C.
    give away
  4. D.
    gives up
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She is such a shy girl that she always avoids ________ in public.


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Several of the passengers were hurt and one was taken to hospital. Luckily ____ was killed.


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His mother doesn't ________ of her going to study in the United States alone．


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Thepopulation of the world is increasing ________.


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