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87. The professor required that ________________ （我们交研究报告）by Wednesday.
88. Though a skilled worker， _______________ （他被公司解雇了）last week because of the economic crisis.
89. It was reported that 65% of traffic accidents in this city _______________ （是由行车不慎造成的）.
90. ________________（希特勒是武装到牙齿的）when he launched the Second World War，but in a few years，he was completely defeated.
91.They are having a discussion ________________（目的是寻找改善质量的途径）.
