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__.