补全对话
（D="Darren," C= Carol）
D: Hi, Caro!   
C: Oh, hi, Darren. I’m just getting ready for the Red Nose Day concert tomorrow.
D: Oh really? Well, I’m free this afternoon.  
C:Actually, I’ve nearly finished. Jim and I are going to put up some ads later, though. Could you please help us with that?
D:   
C: That’s wonderful! Oh, there’s one more thing. Would you mind coming early tomorrow to help sell tickets at the door?
D: Not at all,  
C: Around six would be great.
D: OK. 
C: Great. Thanks, Darren.