Modals: Obligation & Necessity - Exercise

Complete the sentences with mustn't or don't have to / need to.

1. Mark was feeling ill yesterday. He leave the meeting early.
2. The rooms aren’t dirty, so I clean them.
3. You leave any medicine where children can reach them.
4. I know you don't like visiting your Uncle Mike so you come if you don't want.
5. The entrance is free of charge, so you buy a ticket.
6. She apologize to the teacher, because her behaviour was not acceptable.
7. You stand on the plane. There are seats for everyone.
8. You have a ticket with your name on or you can't travel.
9. There are injured people, we call an ambulance
10. We arrived home very early last night. We wait for a taxi.

Your score:
Answer key:

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