补全对话

A. We must be careful with fire. B. We mustn't play with matches at home. C. I can put out fires. D. Are you afraid of fire? E. What mustn't we do in the forest, Mr. Li?

Ann: Hi, Mr. Li. Welcome to our school.

Mr. Li: No, I'm not. I'm a fireman.

Fire is dangerous (危险的). Don't play with fire.

Amy: What mustn't we do at home, Mr. Li?

Mr. Li: We mustn't play near fires.

Tim:

Mr. Li: We mustn't smoke in the forest.

Tim: OK. I understand. Thank you, Mr. Li!