题目内容
He cleaned the old machine and ______ the moving parts with a little mineral oil, hoping that it could work again.
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During his work on child protection, he often acts as a(an) ________ between parents and children, making the parents know what they can do and what they cannot do.
He feels that he was ________ to become a musician.
They only publish novels which ________ the mass-market.
Language teachers often ______ examples ______ grammar books.
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