Complete the sentences with the correct modal verb. Use must, mustn't, or don't have to.

Решение:

We don't have to go to school from Monday to Friday. We don't have to wear a uniform, so I normally don't have to go to every class. In class, we mustn't shout, play or sing. We don't have to have lunch at school, so I sometimes go home. When school finishes, I must look after my little sister. When my parents arrive late, and we don't have to stay in, so I usually go out with my friends. When I get home, I must do my homework. I don't have to go to bed late, except on Fridays, when I don't have to go to bed before midnight.