I 1 a bad cold yesterday. So I didn't go to school 2 morning. After breakfast, I 3 a book. There're many signs 4 it. From this book I know 5 about traffic(交通). We should walk or drive on the 6 of the road(路)and get slower(慢下来)at the crossing of the roa D. “Red light”means“ 7”. “Green light”means” 8”. We 9 go in the time of “Red light”. We must 10 the“Green light”and go.