11．Please keepquiet （quiet/quietly）in the library．

分析 翻譯：在圖書館請保持安靜．

解答 keep 在這里是系動詞，keep quiet，固定搭配，保持安靜的意思，quiet作形容詞用，形容詞可以做表語；quietly為副詞，副詞（adv）主要是用來修飾動詞、形容詞．
故填：quiet．

點評 quiet 是形容詞，而形容詞一般修飾名詞、系動詞、感官動詞；quietly 是副詞，副詞一般修飾實義動詞、形容詞．

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