Прочитайте правила поведения учащихся в школе и вставьте пропущенные слова must, mustn't, can, can't. Запишите ответы кратко.
1. Students wear a school uniform every day, but on Friday they be dressed as they wish.
2. Students be late for the lesson.
3. Students ask for help and have extra-classes.
4. Students talk at the lesson.
5. Students ask a question only with their hand raised. ​