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Fire can help people in many ways. Fire can heat water, (21)____ your house, give light and cook foo...
题目内容：
Fire can help people in many ways. Fire can heat water, (21)____ your house, give light and cook food. But fire can burn things too. Nobody knows (22)____ people began to use fire. One story from Australia tells about a man a very long time ago. He (23)____ the sun by a rope and brought fire down.
Today people know how to (24)____ a fire with matches. Children sometimes like to play with them. But matches can be very (25)____.
Fire kills people every year. So you must be careful (26)____ matches. You should also learn to (27)____ fires. Fires need oxygen（氧气）. Without oxygen they die. There is (28)____ in the air. Cover a fire with water, sand, or (29)____, with your coat or a blanket. This keeps the air from a fire and kills it.
Be careful with fire, and it will help you. Be careless with fire, and it might (30)____ you.
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