I warn the ships., I keep the cars safe., I communicate using light and sound., I warn you if there is any fire., smoke detector, traffic light, police car, Light house communicat using......., sound, light, light and sound, Fire truck communicate using........., light, sound, light and sound, Morse code communicate using..............., light, sound, light and sound, The green color in the traffic light means......., stop, ready, go, what device keep the ships safe?, light house, traffic light, smoke detector, we can communicate using light., true, false

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