You had followed my orders。

88. Despite the hardship he encountered, Mark never ___(放弃对知识的追求)

abandoned the pursuit of knowledge。

89. Scientists agree that it will be a long time before____(我们找到治愈癌症的方法)

We find the cure for cancer。

90. Production has to be increased considerably to ___ . (与消费者不断增长的需求保持同步)

Keep up with the constantly growing needs of consumers。

91. The more exercise you take, ____ 。(你越不大可能感冒)

The less likely you are to catch a cold。