Why is he soldering the wire? - The electrical connection was loose., Why are you recharging the batteries? - They were flat., Why are they unblocking the filter? - It was blocked with dirt., Why are you changing the bulb? - It was burnt down., Why is he sharpening the scissors? - They were blunt., Why are they cleaning the tank? - It was dirty., Why is he tightening that screw? - It was loose., Why is she cleaning the paper tray? - It was jammed.,

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