Rewrite the rules according to the example

You mustlisten to your teacher. — Listen to your teacher.

You mustn'tbe late for school. — Don'tbe late for school.

1. You mustn't sleep at school. [ ] at school.
2. You must sit at your desk. [ ] at your desk.
3. You mustn't cheat on tests. [ ] on tests.
4. You must do your homework. [ ] your homework.
5. You mustn't open the door to unknown people. [ ] the door to unknown people.
6. You must buy a ticket on a tram. [ ] a ticket on a tram.