A: Good morning, madam. 1) May/Must I help you? You 2) might/mustn't be able to. I need a ball of wool that is the same colour as my jumper. A: Just a moment, please. I 3) must/mustn't look in the stock room. We 4) might/might not have some left. I'm not sure. B: The wool 5) must/mustn't be exactly the same colour, it 6) must/mustn't be different. A: 7) Could/Mustn't I ask you a question, madam? B: Yes. A: What do you want the wool for? B: I 8) could/must finish knitting this jumper. It only has one sleeve at the moment!​