补全对话。

W: Hi, Sam! 1________.

M: I’m reading a book about magic(魔术).

W: 2_____      ?

M:. Yes, I like magic very much. My favorite magician is Liu Qian.

W: Do you want to be a magician?

M: 3________. I just want to know how he does his magic.

W: Magic is really interesting. I want to buy a book about magic, too. 4________ ?

M: In the Xinhua bookstore.

W: Can you go to the bookstore with me now?

M: 5________ . How about tomorrow afternoon?

W: Ok. Thank you.

CNC系统软件结构分为前后台结构、（）和多功能模块结构三大类。