I. Choose the correct answer I can / must go to the doctor. I’m feeling ill. You could / may open your books. May / Must I have some more tea? They can’t / mustn’t give alcohol to the animals. That collar is too expensive. We can’t / may not buy it. You must / mustn’t be home by 10 o’clock. I’ll be waiting for you. I’m afraid I may not / can’t go to the dentist with you. May / Can I take your dog to the vet? I’ve already told you! You can’t / couldn’t eat any more sweets! Yes, you may / must go out with your friends.