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There are great many reasons for studying what philosophers 1.________ have said in the past. One is that we cannot separate the history of philosophy from which of science. Philosophy is 2.________ large discussion about matters on which few people are quite 3.________ certain, and those few hold opposite opinions. As knowledge increases, philosophy buds off the sciences. ª¥ For an example, in the ancient world and the Middle Ages 4.________ philosophers discussed motion. Aristotle and St. Thomas Aquinas taught that a moving body would slow down until a force 5.________ were constantly applied to it. They were wrong. It goes on moving unless something slows it down. But they had good arguments on their side, and if we study these, and the experiments which proved them right this will help us to distinguish truth 6.________ from false in the scientific controversies of today. ª¥7.________