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求老师解答:用所给词的适当形式填

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求老师解答:用所给词的适当形式填
用所给词的适当形式填空
1.We're doctors,so it's our _______ (duty) to save patients.
2.The road is _______ (crowd).Mr.Wang drives his car slowly.
3.What causes the _______ (ill)?
4.Did they enjoy _______ (they) in the party yesterday?
5.—Where is your mother,Beibei?
    —She is busy _______ (answer) the telephone.
1.duty   2.crowded   3.illness  4.themselves  5.answering