完形填空。
Traffic lights are the _________ in every country. There are _________ kinds of lights, red, yellow and green. Stop and wait _________ a red light. _________ at a green light. Slow down _________ stop at a yellow light. In China and the USA, people drive _________ the right side of the road. But in the UK, Japan and Australia, people drive on the _________ side of the road. Everyone should pay attention _________ the traffic lights.
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