在空格中填上合适的单词,使短文完整.
You must know the ______ ________ if you walk in the city .There are always ________ lights.You can go at the _______ light and you must stop at the ________ light.The _______ means "wait".If you drive _____ car,you must drive on the ______ side of the road in China.In England,however,drivers ________ on the _______ side of the road.