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 {#blank#}1{#/blank#} river?
A: No, there isn't. There is a fish in the {#blank#}2{#/blank#}.
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: {#blank#}3{#/blank#}.
B: Look! There is a {#blank#}4{#/blank#} sky!
A&B: Ha ha! How funny!
