根据上下文完成对话。
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.”