87. You would not have failed if you had followed my instructions.(按照我的指令去做). if从句的虚拟语气：过去
88. Despite the hardship he encountered, Mark never gave up pursuing knowledge . (放弃对知识的追求)短语give up doing
89. Scientists agree that it will be a long time before we find the methods to cure cancers.(我们找到治愈癌症的方法)句型it will be a long time before
90. Production has to be increased considerably to keep pace with the constantly increasing demands of consumers. (与消费者不断增长的需求保持同步)
短语keep pace with
91. The more exercise you take, the fewer chances you will have to catch a cold.(你越不大可能感冒). the+比较级+主+谓，the+比较级+主+谓
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