Last week was Road Safety Week at Jim's school.All the students had to take part in a talk on road safety which was given by a police officer.The following is what the police officer said.
   "Most traffic accidents shouldn't happen.They happen because people are careless.A usual cause of traffic accidents is speed.Some people drive too quickly.You need to remember this when you are crossing the street or walking along the sidewalk，or you will be hurt，even lose your life."
   "It's not only drivers who cause accidents but also walkers，and bicycle riders often cause accidents，too.Walkers 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 suddenly or without warning other road users.Before you turn left，for example，you should check behind you to make sure there aren't any cars，trucks or buses coming.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  5 ，we should not have accidents any more."
注：每題答案不超過(guò)6個(gè)詞。

（1）Who gave the students a talk about Road Safety in Jim's school？

A police officer.

A police officer.

（2）What does the underlined word "this" refer to（指代） in Paragraph 2？

Some people drive too quickly.

Some people drive too quickly.

（3）What makes you safe before stepping into the street according to the passage？

Always look on both sides.

Always look on both sides.

（4）How many reasons for accidents are mentioned in the passage？

Three.

Three.

（5）Please fill in the blank in the last paragraph.

learn them and obey them.

learn them and obey them.