От Write must or must not:
1. You brush your teeth twice a day.
2. Students use their mobile phones during the exam.
3. People break the traffic rules.
4. You study hard if you want to pass the exam.
5. I go now. They are waiting for me.
6. You listen to loud music late at night.
1) must
2) must not
3) must
4) must
5) must
6) must not
1. must
2. must not
3. must not
4. must
5. Я незнаю
6. must not