Concept:This question tests the correct modal expression for a duty or obligation that must be fulfilled by tomorrow.Explanation:"ought to do" shows a strong expectation or moral obligation, just like "should do.""may do" and "might do" only suggest possibility, not a required action."like to do" expresses a preference, which does not match the idea of a task due tomorrow.Therefore, "ought to do" is the best choice because it clearly conveys that the action is expected.Answer:B. ought to do