Three things are necessary for you to keep alive. What are they? They are air, water and food. We eat food twice 1 three times a day. We drink water several times a day. We breathe air day and 2 . If a man does not eat 3 food and does not drink anything, he can live for about three days. But if he does not breathe, he can keep alive for only about three minutes. 4 we can see that breathing is more important than 5 , and drinking is more important than eating. We 6 live if there is no air or water or food. For us, food is very important, water is more important, and air is the 7 important. Why? Because we can only live for about three minutes 8 air. Three minutes— 9 a short time it is! Food and water are less important than air, but we can't be short of them, 10 .