We ____ smoke at school.
mustn't
If you go to a birthday party, you ___ take a present.
are supposed to
Your birthday is in April? You ___ be an Aries!
MUST
You ____ wear a seat belt when driving a car
have to
You ____ spend much money on the present. You can buy something cheap.
DON'T NEED TO
You've had a long journey, you___ be tired.
MUST
Laura could know the answer. You ____ ask her.
should
- Someone knocked at the door. - It ___ the postman, I don't know.
might/ could