根据句子意思和首字母提示补全单词或用括号中所给词的适当形式填空。

－How long have you c________ stamps?

－For three years and a half．

根据句子意思和首字母提示补全单词或用括号中所给词的适当形式填空。Would you mind k________ your voice down? They are having a meeting．

根据句子意思和首字母提示补全单词或用括号中所给词的适当形式填空。Nearly all the singers sang ________ (clear)．

根据句子意思和首字母提示补全单词或用括号中所给词的适当形式填空。

He ________ (ask)to clean the classroom by the teacher．

根据句子意思和首字母提示补全单词或用括号中所给词的适当形式填空。

There are too many ________ (mouse)in the old building．