Fill in the gaps with modal verbs.
1. To stay healthy you [should], [needn`t], [mustn`t] eat more fruit and vegetables.
2. She [doesn`t have to], [ought to], [must] cook dinner tonight, they are eating out.
3. You [mustn`t], [might], [can] eat ice-cream in cold weather.
4. [Can], [must], [should] I treat you with home-made cakes?
5. You [needn`t], [must], [should] be a member of a club to use the gym.