补全对话。 在横线上填上一个适当的单词, 补全对话。

A: May I help you?

B: Yes, . I want to join a club.

A: What do you want to ?  

B: Sorry, I don't know.

A: What you do?

B: I can the guitar, I can't play well.

A: Can you ?  

B: Yes, I think I can sing very .  

A: OK, you can join the club.

B: Thanks a lot.

A: Not at all.