Ответ:
1. May I close the window?-B Yes, that's fine. It is a bit cold in here.
2. Can I use your camera?-F Yes. Here you are.
3. Could I borrow your keys?-C No way! You are always losing them!
4.Can I have some ice-cream?-I'm afraid we don't have any left.
5. May I come in?-D Of course. We are glad to see you.