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It's the first day at a new school, and you're reading the student handbook. Select ALL the sentences that correctly express necessity or obligation.
The correct answers are Students must wear a uniform every day, You need to bring your student ID to every exam, and You have to return library books within two weeks.
"Don't have to" means something is NOT necessary, so it contradicts "it's required." Also, "must" is never followed by "to" — we say "must check," not "must to check." The three correct options all properly express obligation using must, need to, and have to.