Help Sarah give some hypothetical advice to her exhausted friend.

If you actually talked to your roommate about her midnight tuba practice, she ______ a bit more considerate.

The correct answer is might be.

This is a second conditional sentence, which imagines a hypothetical situation ("If you actually talked..."). In the main clause, we use "would," "could," or "might" plus the base verb. "Might be" perfectly captures the possibility that the roommate would change her noisy ways!