Answer: C) slept.
Explanation: Verbs come in three tenses: past, present, and future. The past is used to describe things that have already happened. The present tense is used to describe things that are happening right now, or things that are continuous. And the future is used to describe things that will happen. In this case the verb "sleep" is irregular, and its past tense is "slept" so the correct answer would be: Harris slept through his chemistry exam.
