Fill in the Blanks Origins of fireOnline version Complete the gaps of the text with the images below. by María Sanz Rodríguez 1 rocks cook Stone energy tribes fire Africa strikes sticks monkeys It was probably people in who first began to use for cooking , about 800 , 000 or a million years ago . People had always known about fire , because fires happened naturally when there were lightning or sparks from two hitting together . Probably the first people who made their own fires started them from fires that were already going . Then they figured out how to make fires by hitting flints together or by rubbing two together . Fire was a very early invention , only a little after simple tools like stone choppers , and before clothing . Making their own fires let people their food . Cooked food is easier to digest than raw food , and people can get more from it with less work . This extra energy may have been what helped people grow bigger brains than , and get smarter so they could invent other things . At the same time , once people needed fires to cook their food , they couldn't just go off alone into the forest - they needed to all sit together around their fire . In the Age , it was too hard to make your own fire . This encouraged people to learn to get along with each other and cooperate instead of fighting , and helped to form organized .
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