Ex.1 Underline the correct answer A: Good morning, madam. May/must I help you?B: You might/mustn’tbe able to. I need a ball of wool that is the same color as my jumper.A: Just a moment, please. I must/mustn’t look in the stock room. We might/might not have some left. I’m not sure.B: The wool must/mustn’tbe exactly the same color, it must/mustn’tbe different.A: Could/Mustn’tI ask you a question, madam? B: Yes. A: What do you want the wool for?B: I could/mustfinish knitting this jumper. It only has one sleeve at the moment!

A:May
B: might
A:must;
Might
B:must;
Mustnt
A: could
B:must