1) - b) mustn't
2) - c) don't have to
3) - b) have to
4) - c) mustn't
5) - a) must
1) They can't work 5 hours on Saturdays.
2) I'm not allowed to ride a scooter.
3) We couldn't study English at primary school.
4) He wasn't allowed to stay out late.
5) They can't choose their religion.
6) We're not allowed to use a dictionary in class.
1) - I've
2) - since
3) - when
4) - I'd
5) - can't
6) - have to
7) - pass
8) - better