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 ________.
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