For Questions 16 through 20, select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.
UntilAndrew learned to ______ a strict schedule, he seldom managed to complete his homework in a timely manner. A、infer from B、commingle with C、adhere to D、vacillate from E、inure to F. stick with