5. Students/ mustn’t/ go/ run / freely/ the class.
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6. children / spend / only / small part / free time / play / electronic games.
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7. They/ ought/ clean/ staircase/ before/ go/ out/ their friends.
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Students mustn't go and run freely in the class
Children should spend only a small part of their free time playing computer games
They ought to clean the staircase before going out with their friends