Last week was Road Safety（安全 ）Week at Jason's school.He understood the importance of following road rules after listening to the talk given by the police at school.The following is what the police said.
   "Most traffic（交通） accidents shouldn't happen.They happen because people are careless.Some people drive too fast.This means that if they have to stop suddenly（突然地），they may hit other cars or people." "It's not only drivers who cause accidents.Pedestrians（行人） and bicycle riders often cause accidents，too.Pedestrians sometimes walk out into the street without looking.You should always look on both sides before stepping into the street."
   "Do any of you ride a bike？Bicycle riders can cause accidents by changing directions（方向） suddenly without giving any signs to other people on the road.Before you turn left，for example，you should look behind you to make sure there aren't any cars or buses coming.
   Then you should show with your left hand to tell that you want to turn left.You should not turn until the street is clear."
   The rules of the road are very simple.If we learn them and follow them，we may have fewer accidents.
（1）Most traffic accidents happen because people are

careless

careless

.
（2）Drivers，

pedestrians

pedestrians

and

bicycle riders

bicycle riders

all can cause accidents.
（3）Before stepping into the street，you should always look on

both sides

both sides

.
（4）Don 't turn until the street is

clear

clear

when you ride a bike on the road.
（5）If everyone learns the

rules

rules

of the road and

follows

follows

them，there will be

fewer

fewer

accidents.