问题标题：
7.Hehastokeepquietinclass.(改为一般疑问句）__he__tokeepquietinclass?8.Wemustbequietinlibrary.(改为同义句）9.Runinthehallways.(改为否定句）____inthehallways.10.Hecansing,too.(改为否定句）He__sing__.
问题描述：
7.Hehastokeepquietinclass.(改为一般疑问句）__he__tokeepquietinclass?8.Wemustbe
quietinlibrary.(改为同义句）
9.Runinthehallways.(改为否定句）
____inthehallways.
10.Hecansing,too.(改为否定句）
He__sing__.
孙颖楷回答：
应该是
7 Doeshave
8Wehavetobequietinlibrary.
9Don'trun
10can'teither.
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