Ответ:

1. B. Sorry, but I really can't.

2. B. She must be in a meeting.

3. A. You mustn't eat here.

4. A. Would I see you for a moment?

5. B. I ought to go to the bank.

6. B. I have no idea! He must have gone to lunch.

7. B. I don't need to work late tomorrow.

8. A. Everyone must wear gloves before the touch the wires.