填空题 A. Thanks a lot.
B. You are welcome.
C. What can I do for you?
D. See you later.
E. Fine, thank you.
F. How do you do?
G. Certainly.

填空题 Can I help you?

填空题 Thank you very much.

填空题 That's all right.

填空题 How are you?

填空题 Of course.