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Read the passage, write the topic sentence, supporting sentence, or cocluding sentence on the line. 1______Why are there so many fake commodities (假冒商品)? 2______First, some Factories want to gain more profits, so they put a false brand name on their products to cheat the customers. 3______Second, some customers buy fake commodities to satisfy their vanity (虚荣心). 4_______Finally, some fake commodities, a fake Nike bag for instance, though much cheaper, serve as well as those genuine ones. 5______So, quite a few people are willing to buy them.