Most radio and television stations in the United States are commercial stations,_____1____is tosay, they earn their money from____2____or commercials. Private companies purchase, radio and television ____ 3____from the commercial stations in order to ____ 4____ their products. Cable television sta-tions are also ____ 5____ stations, though they do not usually have advertisements.____ 6____ watch cablestations, people must pay the cable TV company a certain amount of money each ____ 7____. Public radio and television stations, on the ____ 8____ hand, do not have advertisements and peo-ple do not have to ____ 9____ to watch them. These stations gain their money ____ 10____the govern-ment, private companies, and from some of the ____ 11____ who watch or listen to their programs.The ____ 12____ government and some large corporations give ____ 13____ , large gifts on money, to thepublic stations. Small businesses and people also ____ 14____ money to their local public radio and television stations. ABC, CBS, and NBC are the three ____ 50____ commercial radio and television ____ 16____ in the UnitedStates. Most local commercial radio and TV stations ____ 17____ their programs from one of these na-tional networks. ____ 18____example, each network has a TV news program in the evening, ____ 19____thelocal stations broadcast in addition to their ____ 20____ local news programs.