Traffic signals are (33) ____(so/too) important today that they regulate the flow of vehicle on (34)___(busy/crowded) roads. Normally, we find them in areas (35)____(where/there) the roads are full of vehicles. When one lane is allowed to ____(36) ( move/walk), all the other lanes are stopped. The three lights, red, yellow, and green are the symbols for stop, ready to stop (37) _____(and/ therefore) go.
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33 so, 34 crowded , 35 where, 36 walk , 37 and.
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