在下面这些词和短语中挑选一个合适的填入各句的空格中，使句子既

题目描述

在下面这些词和短语中挑选一个合适的填入各句的空格中，使句子既完整又符合逻辑：therefore，hence，on the other hand，thus，but，however，consequently，nevertheless，moreover，or，and，on the contrarv1)Our Accounts Receivable Department has written to vou three times;_____，we have had rio response to our ietters.2)The bill of lading did not match the order;_____，the shipment was refused.3)Jeanette considered the possibility of changing a job_____was unwilling to accept the risks involved.4)Please place your order immediately，_____you will not be eligible for the discount.5)Information concerning equipment used in business offices is needed;_____，we are conducting a survey.6)Members of our management staff,_____，are interested in hiring a consultant to train customer personnel.7)0ur department is currently understaffed;_____we are behind on our production schedule.8)Servco has produced_____a tool with remarkable safety lealures and excellent ease of handling.