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.
—Is your sister sleeping?
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