一Can I help you? 

一_________．

A．No，please don’t          B．Yes，please               C．You're welcome

—Can I help you?

—________.

[　　]

—Can I help you?

—________.

[　　]

－Shall I help you with the bags? I'm afraid you can't carry it. After all, it's so heavy.

－________.

[　　]

A．Go ahead, please

B．I don't want to trouble you too much

C．No, don't do that again

D．It's all right, thanks.