根据上下文完成对话，每空填一词。

A: was your Spring Festival? Were you happy?

B: Of course. I saw lots of interesting things.

A: Did you the fireworks and firecrackers?

B: No, I think the from them makes the city dirty. So I do that.

A: What did you do then?

B: I the old paper to make some paper cuts(剪纸) and them on the door.

A: It's a good way to keep our city .

B: Yes. We'll have a class for this winter holiday.

A: was it?

B: Protect the . Would you like to join us?

A: Yes, I'd love to.