Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Water is one of our most (31) ______ natural resources. We need (32) ______ it daily to stay alive. We also use water for cooking, cleaning and, of course, splashing and swimming- and for making skating rings in winter! Water is vital to our economy, too- from (33) ______ food to run factories. We also turn the energy of moving water- like Niagara Fall- into (34) ______ power. Like electricity, we expect to have good, clean water at the turn of the tap. It has to travel to us and after we use it, water (35) ______ and return to its source-usually nearby rivers or lakes. All of this activity takes energy. Saving water means saving energy. The less water you use, the less energy is used to pump, treat, distribute and recover it. Blank 34 A. electric B. hydroelectric C. geothermal D. solar 18