根据图片，将对话补充完整

A: Hi! I have a very funny picture!

B: Really? Let me guess! Is there river?

A: No, there isn't. There is a fish in the .

B: Is there a rabbit on the grass?

A: No, there isn't. There is a rabbit in the river!

B: Are there many trees in the forest?

A: .

B: Look! There is a sky!

A&B: Ha ha! How funny!