Read the text and answer the questions. (1m) Fire was very important to man. He needed fire to keep himself warm at night. He used fire to cook his food. He used fire to frighten away enemies and wild animals. In some parts of the world he used fire to signal messages. Red Indians, for example, used fire to make smoke signals. Fire was also used to give light. Before the invention of the oil lamp, man used burning sticks as torches. And before man discovered gas and electricity, he hung small fires in wire baskets from posts to light the street. One man even used fire to tell the time. He invented a candle clock. He made a candle that took exactly twelve hours to burn.Then he marked this candle in twelve equal parts. He lit the candle and could tell the time by counting the number of parts left of the burning candle. But the candle clock did not always work well. 21. What did man probably first used fire for? .. 22. For what purpose was fire used by Red Indians? ... 23. What were the first street lights? 24. How long did the candle clock take to burn? .