补全对话（其中有一个多余选项）。

A. What are they going to do? B. Oh no, they must be very sad. C. They're going to Spain. D. They're going on foot. E. What is it about? F. But the train driver doesn't wait.

Sarah: Hey, Sam! I read an interesting story on the book.

Sam: Really?

Sarah: The two snails.

Sam: So are they in Spain now?

Sarah: Yes. At first they want to go by train. Then they ask the postman for help, but he doesn't wait, either.

Sam:

How are they going there at last?

Sarah:

Sam: Wow, it's such a long way.