1.You're welcome. 2. Don't thank me.
3.That 's all right. 4.Imust be sorry.
5.Don't be sorry. 6. That's all right.
7.May i use your bike? 8.Yes, it is.
9.Yes, you do. 10.Here they are.
11.Yes, please. 12.May I have some coffee?
13.Yes, you have. 14.Yes, you can.
15.Yes, certainly. 16.Happy Children's Day.
17.Can I help you? 18.No,thank you.
19.No,you can't. 20.No, you don't
21.No,it isn't 22.Are you free next Sunday?
23.Yes,I have no time. 24.No.I'll be busy.
25.Yes, you are. 26.No, I don't.
27.Let's meet at the park at five tomorrow morning.
28.Yes,please. 29.Shall we visit the factory?
30.Yes, we do.