4、A、Yes．I think so．                B、I'm afraid not．            C、Very interesting．

3、A、lt’s very kind of you．Thanks a lot．

B、What a pity! I'm afraid that you've lost it．

C、How kind! You are lucky．

2、A、No．it's not nice                  B、Thank you                    C、it's very expensive

1、A、No．Let's go at five o'clock．

B、No．Let's do it a little earlier．

C、Good idea!