1. You ... go swimming in the river. It's too dangerous.
a) don't have to; b) must; c) musn't
2. My dad ... my mum in 1984.
a) met; b) used to meet; c) was meeting
3. ... believe in Vampires?
a) Did you use; b) You used to; c) Did you used to
4. It' s Katie's birthday tomorrow. I ... remember to buy her a card.
a) must; b) musn't; c) don't have to
5. We ... live in a house, but er live in one now.
a) used to; b) didn't use; c) didn't use to

1. c) musn't

2. a) met;

3. a) Did you use;

4. a) must;

5. b) didn't use;