这组对话只有看到最后才好玩，有趣。
A:I want some envelopes,please.
B:Do you want the large size or the small size?
A:The large size,please.
Do you have any writing paper?
B:Yes,we do.
I don't have any small pads.
I only have large ones.
Do you want a pad？
A:Yes,please.
And I want some glue.
B:A bottle of glue.
A:And I want a large box of chalk,too.
B:I only have small boxes.
Do want one?
A:No,thank you.
B:Is that all?
A:That's all,thank you.
B:What else do you want?
A:I want my change.
