7.He has to keep quiet in class.(改为一般疑问句） __he__to keep quiet in class?8.We must be
问题描述：
7.He has to keep quiet in class.(改为一般疑问句） __he__to keep quiet in class?8.We must be
quiet in library.(改为同义句）
9.Run in the hallways.(改为否定句）
__ __ in the hallways.
10.He can sing,too.(改为否定句）
He __ sing __.
答
应该是
7 Does have
8 We have to be quiet in library.
9 Don't run
10 can't either.