Modal verbs (obligation and advice)

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Teachers _________ wear suits for work, but their clothes ______ be neat and clean.

Teachers needn't / don't have to wear suits for work, but their clothes must be neat and clean.

Students _______ use their mobile phones during the lessons.

Students mustn't use their mobile phones during the lessons.

You ________ arrive on time for lessons. It's important not to be late.

You must arrive on time for lessons. It's important not to be late.

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