III. Выберите правильный вариант (must / have to / should).

Решение:

1. You look pale. You should see a doctor.
2. In our school, we have to wear a uniform. It's the rule.
3. I must finish this essay by tomorrow morning. My teacher said it's obligatory.
4. You mustn't smoke here. It's prohibited.
5. You don't have to buy milk; I've already bought some.

Ответ: should; have to; must; mustn't; don't have to.