We ________ at cleaning the classroom.


  1. A.
    by turns
  2. B.
    in turn
  3. C.
    take turns
  4. D.
    by turn
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It's beyond description.Nowhere else in the world ________ such a quiet, beautiful place.


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Computer came into being ________.


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He worked without _____ success. As a doctor, he was not _____ success.


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The officials from the United Nations ________ the fact that Iran isn’t involved in uranium enrichment(鈾濃縮).


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If you go to the western suburbs of the city,you ________ a lot of new buildings.


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Which of the following is not correct?


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He volunteered _____ to remote area to help the people there.


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The ______we got, ______ we could see.


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