选择句子，完成对话上。

A. I'm not sure. B. I'll take them. C. Can I try it on? D. They're a little long. E. Yes, I'm looking for a pair of trousers.

Tom goes into a clothes shop. He is going to buy something for the Children's Day party.

Assistant: Can I help you?

Tom:
Assistant: Look at these trousers. Which pair of trousers do you like, the black one or the blue one?

Tom: The black one.

Assistant: Of course. And what size are you?

Tom:

Assistant: OK, try a size 10. The fitting room(试衣间) is over there. (Tom puts on the new trousers.)

Tom: Do you have anything shorter (更短的)?
Assistant: These are shorter.

Tom: