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Lets reviewSlow down and stop at a yellow light.Stop and wait at a red light.Go at a green light.traffic lightsTip:We must pay attention to the traffic lightsBoy:Hey,dont go at the red light.Girl:Oh,right!Thanks.I must pay attention to the traffic lights.Wow！So many pictures of bikes.Where are they from?Theyre from my cousin in the USA.Whats this?A helmetTip:In the USA people on bikes must wear one .