5. Read the rules of one of Moscow schools. Use must, mustn't can, can't.

Правила Московской школы:

• Students must wear a school uniform every day, but on Friday they can dressed as they wish.
• Students mustn't be late for the lesson.
• Students must ask for help and have extra-classes.
• Students mustn't talk at the lesson.
• Students must ask a question only with their hand raised.