Task 2.Choose the correct modal verb.
1. I looked everywhere for the book but I … find it. A) couldn’t B) mustn’t C) shouldn’t
2. You … drive carefully on a busy road. A) can B) should C) may
3. I don’t feel well today. … I leave a bit earlier? A) may B) must C) should
4. Yesterday I stayed at home because I … help my father. A) can B) must C) had to
5. You … use my dictionary as long as you like. A) must B) may C) have to