补全短文
A. in the future B. noxious C. demands D. intensified Phrases: A. Water problems【T13】______will become more intense and more complex B. and many of these will contain chemicals which are【T14】______ C. On the other hand, increasing【T15】______for water will decrease substantially the amount of water available for diluting wastes D. agriculture will have to be【T16】______ 【T17】______Our increasing population will tremendously increase urban wastes, primarily sewage.【T18】______Rapidly expanding industries which involve more and more complex chemical processes will produce larger volumes of liquid wastes,【T19】______To feed our rapidly expanding population,【T20】______This will involve ever-increasing quantities of agricultural chemicals.