Модальные глаголы

Упражнение 1. Complete the sentences with the correct modal verb. Use must, mustn't, or don't have to.

I _________________ (1) go to school from Monday to Friday. We ___________________ (2) wear a uniform, so I normally wear sports clothes. We ___________________ (3) arrive late, and we ___________________ (4)   go to every class. In class, we __________________ (5)  shout, play or sing. We _____________________ (6)  have lunch at school, so I sometimes go home. When school finishes, I ___________________ (7)  look after my little sister. When my parents come home I ______________________ (8) stay in, so I usually go out with my friends. When I get home,                                      I __________________ (9) do my homework. I ____________________ (10)  go to bed late, except on Fridays, when I _________________ (11)  go to bed before midnight.