5．A．Good idea．                    B．Don't say so．                       C．It doesn't matter．

4．A．Thank you for your birthday present．

B．Help yourself to the birthday cake．

C．Happy birthday．

3．A．Sorry，I'm afraid he's out at the moment．

B．Of course you could．             C．If you want，you'll just have to wait．

2．A．I've got a pain here．           B．All right．                            C．I have a good time．

1．A．you are very kind．                B．Yes，of course．

C．Thank you very much．