You... wear a swimming hat in this pool: you can't go in without one.
1. should
2. have to
3. mustn't
Most doctors say you ...... lie in the sun too much.
1. must
2. don't have to
3. shouldn't
Gary ... pay much for air tickets: his brother works for an airline company.
1. doesn't have to
2. mustn't
3. should
How many languages ... study when you were at school?
1. must you
2. did you have to
3. had you to
We ... walk: we can take the bus if you're tired of walking.
1. must'nt
2. shouldn't
3. don't have to
I ... tidy my room today but I'm not going to because I'm not in the mood.
1. should
2. don't have to
3. must
Mum has terrible headaches: she ..... go and see a doctor, but she can't find the time, she says!
1. shouldn't
2. should to
3. should
Don't worry, you ... lend me your car. I can borrow Dave's.
1. shouldn't
2. don't have to
3. mustn't
People ... walk more and drive less: it's healthier and better for the environment.
1. have to
2. must
3. should
This building is very dangerous and you ... go in there. If you do, I shall call the police.
1. should
2. don't have to
3. mustn't

Choose the correct form to complete each sentence: must / mustn't / have to / do(es)n't have to / should / shouldn't / ought to / ought not to.