7. She ... work at the weekend.
a) needn't
c) doesn't need
8. You ...
play football here. It's dangerous.
a) don't have to
b) don't need to
c) mustn't
9. We ... attend all the lessons. We can choose.
a) don't have to
b) mustn't
c) can't
10. I...
... forget to call him tonight.
a) don't have to
b) mustn't
c) mustn't to