1. 根据语境从方框中选择恰当的情态动词填空，有的需要变换形式。

can, mustn't, needn't, must, have to, can't

1. （1） Peter is a famous musician. He plays the violin and healso plays the piano.
3. （2） The restaurantbe very good. It's always full of people.
5. （3） Bill and Sue go away on holiday very often so they be short of money.
7. （4） Last night Don became ill suddenly. We call a doctor.
9. （5） We have enough food at home so wego shopping today.
11. （6） Youeat in class. It's against the rule.