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Review Professor Higgins' famously terrifying class syllabus. Select ALL the phrases that correctly complete his rule about classroom supplies.
"To pass this class, each student ________ bring a perfectly sharpened pencil to every lecture."
The correct answers are must and has to.
"Each student" is a singular subject (he/she/they).
We use the singular form has to instead of "have to".
Must is a modal verb, which means its form never changes regardless of the subject (so "musts" is not a real word!). Both correct options express a strong obligation or rule.