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Miss Fang: Hello, children. This is Mr. Xu. He's a fireman. Let's welcome Mr. Xu.
Mr. Xu: Thanks. Let's talk about safety today. Fire can burn down trees. It can people, too. We must be with fire. What mustn't we do in the forest or at home, children?
Peter: We mustn't in the forest.
Kitty: We mustn't play near fires or play with at home.
Mr. Xu: Very good. Safety first.