Must, mustn't 10 предложение

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вопрос

You must wear a helmet while riding a bike.You mustn't smoke inside the building.Employees must clock in and out for every shift.Students must bring their textbooks to class.You mustn't run in the hallways.Guests must check out by 11am on the day of departure.Drivers must park their cars in designated spots only.Visitors must sign in at the front desk before entering the building.You mustn't use your cell phone during the exam.Employees must attend a safety training seminar next week.