What will you be doing in 2025? Will you be living in an undersea research station? Will you be the chief engineer 32 ___ a bridge across to the planet Mars? the Atlantic Ocean? Will you be leading an 33 ___ Will you be...? You can daydream, of course, but nobody knows exactly what the world will be 34 ___ . But scientists have made some guesses. Based on the advances made, they believe people will be healthier. Diphtheria, malaria, tuberculosis, polio and many other killers are under control now. These diseases are on the way out, 35 ___ to germ-killing chemicals, new ways of finding out about our bodies, and new ways of providing clean, safe 36 ___ and water. Healthier people live longer, so we can expect the world's population to 37 ___ sharply. It may double in the next forty years! This brings up a serious problem: how will we find food, water, and minerals for such a huge population? Scientists are at work on some solutions. From the ocean they hope to get new fertilizers to increase the yield of the soil; new chemicals to kill crop-destroying insects without 38 ___ other animals, new sources of water or supplies of food.