Choose the correct word. You must / needn't / can't eat in the classroom. It's not allowed! Students can't / have to / don't have to take rubbish out. The cleaners will do it. needn't / must / can't enter the building o'clock. The entrance is closed.

Решение:

Выбираем модальные глаголы, соответствующие ситуации:

• can't (нельзя, запрещено) — eating in the classroom is not allowed.
• don't have to (нет необходимости) — cleaners will do it, so students don't need to take rubbish out.
• can't (нельзя, невозможно) — the entrance is closed.

Ответ: can't, don't have to, can't.