87. You would not have failed if___
you had followed my instructions.
88. Despite the hardship he encountered, Mark never ___
gave up pursuing knowlege.
89. Scientists agree that it will be a long time before____
we find the methods of curing cancers.
90. Production has to be increased considerably to ___ .
keep pace with the constantly increasing demands of consumers.
91. The more exercise you take, ____ .
the fewer chances you will have of catching a cold.
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