将下列句子重新排列成一段通顺的对话。

A. How many stamps do you need?

B. I want to buy some stamps and postcards.

C. It's two yuan for one stamp, and it's one yuan for one postcard. That's twenty-five yuan.

D. Five.

E. To the post office.

F. Ten.

G. How many postcards do you need?

H. How much are they?

I. Where are you going?

J. What do you want to do?

正确顺序为：