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You                 tell anyone. It is a big secret.

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You                  tidy up your room.

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The sign says “Stop”. You                 stop here.

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We _______ eat sweets in the classrooms.

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I ______ watch TV late at night. My parents say I must go to bed early.

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You                 turn the music too loud.

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You____ put the rubbish into the bin.

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Travelling on mountains is really dangerous, so you _____ go alone.

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You ______ take photos in this museum. It's against the rule.

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You _____ pick up flowers in the school garden.

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This is the smoking room at this airport . You ______ smoke in this room.

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It’s late. You                  make so much noise.

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mustn't         don't  have to

You                  drive there. You can take the train.

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We                 be home by 9.00 o’clock. The film starts at 9.15.

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You                 do more exercise to stay fit.

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You ________ speak on the mobile phone on an aeroplane.