根据上下文完成对话。（16分）
A:What are you ________?
B: I’m ________ a poster.
A:What’s it __________?
B: It’s about _________and recycling.
A:Can I _______ you?
B: Of course. Welcome.
A:_______ can we draw?
B: We can draw some rubbish.
A:Shall we ________some words?
B: Yes.We can write “Don’t_______them everywhere.”
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