找出下列句子中使用不当的部分：1)Please comple

题目描述

找出下列句子中使用不当的部分：1)Please complete the enclosed questionnaire sent to typical families concerning detergent preferences.2)Our new billing system totals all balances，gives weekly reports， and statements are printed.3)Centralized inspection in one area and floor inspection along the assembly line improve product quality;it is useful when precise stalldards are met.4)Automatic cash transfers can be made only on the written authority of the customer from a cheking account.5)The three basic elements of a computer are input，processor，and output units，which can be obtained in a variety of configuration.6)The next time you travel for business or for pleasure，charge everything to your credit card in the United States.7)Aluminum construction is lightest，wood is cheapest.and the strongest is steel.8)Our objectives are to make our stock profitable，to operate efficiently，and developing good employee relations.