看图,填入所缺的单词完成句子
2.Mr Xu is a ________. He is talking about fire ________.

3.Children can't play with ________. It is dangerous.

4.Fire can start in ________. We must be ________ in it.

5.Look at this sign. It means "Don't ________".

6.I want to go camping with my friend. But we mustn't start ________.

7.—What mustn't we do?—We mustn't play near ________.