The bag is （full of books）.就括号部分提问 （Lily's and Mike's ) bag'

1.The bag is （full of books）.就括号部分提问
答：What's in the bag?
2.（Lily's and Mike's ) bags are heavy.就括号部分提问
答：Whose bags are heavy?
3.Are your teachers old?(做肯定回答）
答：Yes,they are.
4.Is his car dirty?(做否定回答）
答：No,it isn't.
5.Our school buses are full.（改成否定句）
答：Our school buses aren't full.