完形填空：阅读下面短文，掌握其大意，然后从各题所给的四个选项中，选出一个最佳答案。

　　Fire can help people in many ways. But it can also be very (1) . Fire can heat water, warm your house, give light, and cook food. But fire can burn things (2) . It can bum trees, houses, animals , or people. (3) big fires can burn forests.

　　Nobody knows for sure how people began to use fire. But there are many (4) old stories about the first time a man or woman started a fire. One story from Australia (5) about a man a very long time ago. He went (6) the sun by a rope and brought fire down.

　　Today people know how to make a fire with matches. Children sometimes like to play (7) them. But matches can be very dangerous. One match can bum a piece of paper, and then it might burn a house. (8) small fire can become a big fire very fast.

　　Fires kill many people every year. So you must be (9) with matches. You should also learn to put out fires. Fires need oxygen(氧气). (10) oxygen they die. There (11) oxygen in the air. Cover a fire (12) water, sand or in an emergency (紧急情况), with your coat or a blanket. This keeps the air away (13) a fire and kills it.

　　Be careful with fire, and it will (14) you. Be careless with fire, and it (15) hurt you.

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