选择合适的选项补全对话。

A. What is the baby tiger doing?

B. What can you see?

C. What are they doing?

D. What is she doing?

E. Yes, I can.

A:

B: I can see the mother tiger.

A:                                     

B: She's walking.                                 

A:                                     

B: The baby tiger is running.                     

A: Can you see any fish?

B:   

A:

B: They're swimming in the river.