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完形填空系列10 Everyone in business has been told that success is all about attracting and retaining(留住) customers. It sounds simple and achievable. But, 41 , words of wisdom are soon forgotten. Once companies have attracted customers they often 42 the second half of the story. In the excitement of beating off the competition, negotiating prices, securing orders, and delivering the product, managers 43 become carried away. They forget what they regard as the boring side of business--- 44 that the customer remains a customer. 45 to concentrate on retaining as well as attracting customers costs business huge amounts of money annually. It has been estimated that the 46 company loses between 10 and 30 percent of its customers every year. In constantly changing 47 , this is not surprising. What is surprising is the fact that few companies have any idea how many customers they have lost. Only now are organizations beginning to wake up to these lost opportunities and calculate the 48 implications. 49 the number of customers a company loses can make a big 50 in its performance. Research in the US found that a five percent decrease in the number of defecting(流失的) customers led to | 
