Fill in each gap with ONE suitable word to complete the passage. (10 points) Food plays an important part in the development of nations. In countries where food is scare, people have to (61) ____ most of their time getting enough to eat. This usually slows (62) ____ progress, because men have little time to (63) ____ to science, industry, government, and art. In nations (64) ____ food is plentiful and easy to get, men have more time to spend on activities that lead to progress and enjoyment of leisure. The (65) ___ of providing good food for everybody has not (66) ___ solved. Many wars have been fought for food. But it is (67) ____ longer necessary to go to wars for food. Nations (68) ___ beginning to put scientific knowledge to work for a (69) ___ of their food problems. They work together in the Food and Agriculture Organization (FAO) to (70)____ hungry nations produce more food.