补全对话。 A. it's not a good manner in public places. B. It's also very dangerous.
C. Let me take a photo for you. D. I think he is taking photos.
E. It's the longest wall in the world. F. I want to take better photos.
Mary：Wow, look at the Great Wall. It's really great.
Tracy：Yes, {#blank#}1{#/blank#}
Mary：Oh, look at that man over there. What is he doing?
Tracy：{#blank#}2{#/blank#}But he is climbing up on a tree.
Mary：That's a bad manner. {#blank#}3{#/blank#}
Tracy：Yes, we should tell him not to climb up on that tree. Let's go.
Mary：Excuse me, sir.
Man：Yes?
Tracy：What are you doing up there?
Man：{#blank#}4{#/blank#}.
Tracy：But it's not safe to climb up on the tree and {#blank#}5{#/blank#}.
Man：Right, thank you very much. I shouldn't do that{#blank#}6{#/blank#}.
Mary and Tracy：OK. Smile!
