Question

1 You have to/mustn't eat a healthy breakfast
every morning.
2 You must/mustn't be careful with what you
eat.
3 We mustn't/have to exercise every day for
at least 30 minutes.
4 You must/mustn't go to the doctor when
you have a cold. ​

Answer 1

1 You have to

2 You must

3 We have to

4 You must