Краткое пояснение: Перефразируем предложения, заменяя плохое поведение на хорошее, используя модальный глагол "should".
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A teenager listens to music without headphones on the school bus. → A teenager should listen to music with headphones on the school bus.
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A student cheats on a test by looking at his neighbour's paper. → A student shouldn't cheat on a test by looking at his neighbour's paper.
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A girl interrupts the teacher while she is speaking. → A girl shouldn't interrupt the teacher while she is speaking.
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A boy pushes others in the corridor to get to his class first. → A boy shouldn't push others in the corridor to get to his class first.
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A student leaves rubbish on the classroom floor. → A student shouldn't leave rubbish on the classroom floor.
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A child copies homework from a friend instead of doing it himself. → A child shouldn't copy homework from a friend instead of doing it himself.
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A group of students gossips about their classmate's appearance. → A group of students shouldn't gossip about their classmate's appearance.
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A teenager ignores his parents when they ask about school. → A teenager shouldn't ignore his parents when they ask about school.
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A boy slams the door when he is angry. → A boy shouldn't slam the door when he is angry.
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A student takes someone's pen without asking. → A student shouldn't take someone's pen without asking.
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A girl pretends not to hear the teacher calling her name. → A girl shouldn't pretend not to hear the teacher calling her name.
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A teenager doesn't say "thank you" to the canteen worker. → A teenager should say "thank you" to the canteen worker.
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A student calls another student a bad name. → A student shouldn't call another student a bad name.
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A friend is always late for meetings after school. → A friend shouldn't be late for meetings after school.
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A teenager rolls his eyes when his mum gives him advice. → A teenager shouldn't roll his eyes when his mum gives him advice.
Ответ: See the list above