People ( ) always be careful with fire,or it can be dangerous.填什么?

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People()alwaysbecarefulwithfire,oritcanbedangerous.填什么?People()alwaysbecarefulwithfire,oritcanbedang

People ( ) always be careful with fire,or it can be dangerous.填什么?
People ( ) always be careful with fire,or it can be dangerous.填什么?

People ( ) always be careful with fire,or it can be dangerous.填什么?
must 必须

should
或者
must

must
必须
人们必须小心防火,否则会很危险。