87. You would not have failed if_you had followed my instructions（按照我的指令去做）

88. Despite the hardship he encountered, Mark never__gave up pursuing knowlege_（放弃对知识的追求）

89. Scientists agree that it will be a long time before we find the methods of curing cancers（我们找到治愈癌症的方法）

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）

91. The more exercise you take, the fewer chances you will have of catching a cold.（你越不大可能感冒）