补全对话。

A. Sure. B. Because they can't find enough food in winter. C. It is an interesting book. D. I am reading a book. E. Why do the bears sleep in winter?

Jill: What are you doing, Alice?

Alice:

Jill: Can we read it together?

Alice: It says wild geese change homes twice every year.

Jill: Why do wild geese change homes?

Alice: So they fly south in autumn.

Jill: Look at the bears. It says they sleep in winter.

Alice:

Jill: Because they don't need food when they sleep in winter.

Alice: