选词填空。



Melinda and Helen are talking about 回答


, a piece of office equipment. Actually, it has 回答


to do with pigeons, and it is used to store 回答


in a systematic way. Each pigeon hole is a 回答


that is clearly 回答


. When the papers are 回答


in current use, they can be 回答


to the long-term 回答

★pigeon hole: a small open space in a desk, cabinet, or wall for keeping letters or papers.

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