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When the world was very young, people lived in hot places. They 1. live in cold places because they could not keep warm there.

At first men didn't know 2. to make a fire. Sometimes trees were hit by lightning. Then a fire was started. A fire was very important for three reasons. It kept them warm. Wild animals were frightened when they saw it. And when food 3. cooked on the fire, it tasted much better.

But men didn't know how to make a fire. When they had a fire, they didn't let it stop burning. If it went 4., they had to wait for lightning to start another fire. Sometimes they had to wait for years.

Later, they learned how to make a fire. But it was not easy 5. make something burn.

Now we have matches. We can carry them in our pockets and make a fire whenever we want it.

九年级英语单词填空困难题

少年,再来一题如何?
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