Because there are so many bikes, cars and buses on the roads all the time, it is very important for riders
 to remember the traffic rules.
     Young children may not ride bikes in the streets, because there are so many cars and buses that it is
dangerous. A rider should keep one hand on the handlebars (把手) at all times. You should ride on the
right of the road. Like a driver of a car or a bus, you must follow all traffic signs. Everybody knows
that you must not turn left or go across at a red traffic light. Usually you can turn right, but you shouldn't
ride too fast.
     If you want to turn or stop, you must give a sign to other riders.
1. It's very important for riders to remember the _____ _____.
2. It's _____ for young children to ride bikes in the streets.
3. You should ride _____ _____ _____ of the road.
4. When you ride, you must follow all _____ _____.
5. Riders can turn _____ when the traffic lights are red.