根据上下文的意思，从方框中选择句子补全对话，使其意思完整。

A. By subway.  B. What are you going to buy? C. Why not? D. Where are you going tomorrow? E. At 9:00 in the morning.

Sarah: Hi, Amy. 

Amy: I'm going to the bookstore.

Sarah: 

Amy: I'm going to buy a comic book.

Sarah: When are you going?

Amy: 

Sarah: How do you go there?

Amy: It's fast and cheap.

Sarah: Can I go with you?

Amy: Sure. 

Sarah:OK. See you tomorrow.