Does the lady buy any chalk?
A:I want some envelopes, please.
B:Do you want the large size or the small size?
A:The large size, please.
B:Do you have any writing paper?
A:Yes, we do.
B:I don‘t have any small pads.
I only have large ones.
Do you want a pad?
A:Yes, please.
B:And I want some glue.
A:A bottle of glue.
B:And I want a large box of chalk, too.
A:I only have small boxes.
B:Do you want one?
A:No, thank you.
B:Is that all?
A:That‘s all, thank you.
B:What do you want else?
A:I want my change.
原文：http://www.cnblogs.com/lexiaofei/p/6723140.html