11.Well done!You have worked out all these physics problems (correct) .

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() 2. 一I'm sorry,sir. Fve made a lot of mistakes in the exam.

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5.This is a day in the history of their country.

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9.The (速度) of light is much faster than that of sound.

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5.Please tell me if she (come) again next time.

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2.It is too cold for us to go out at night on Mars.(改為同義句)

  It is                         can’t go out at night on Mars.

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9. My daughter studies at a medical (學院) .

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