5. ______ wear a shirt and a tie. He can wear what he wants. That's not fair!

The sentence is incomplete and lacks context to provide a meaningful answer. It appears to be a fill-in-the-blank question where a subject is missing before "wear a shirt and a tie." To complete it, a noun or pronoun describing who wears the shirt and tie is needed. The exclamation "That's not fair!" suggests a comparison or contrast with a previous statement.