阅读下面短文，根据其内容回答后面所提问题或完成句子。
People are often killed while crossing the road. Most of these people are old people and children. Old
people are often killed because they usually can not see or hear very well. Children are often killed because
they are not careful. They have to look and listen before they cross the road.
A car, truck or bus can not stop very quickly. If the vehicle (汽车) is going very fast, it will travel many
meters before it stops. People don't always understand this. They think a car can stop within a few meters.
The faster a car is traveling, the longer it takes to stop. It is very difficult for a person to know how far a car
is traveling.
The only safe way to cross the road is to look both ways, right and left. Then if the road is clear, it is
safe to cross. The right way to cross the road is to walk quickly. It is not safe to run. If people run across
the road, they may fall down.
1. Who are often killed while crossing?
2. Why are children killed when crossing the road?
3. Is it easy for a driver to stop his vehicle when he finds something wrong some meters in front of him?
4. What had you better do when you cross the road?
5. Even though the vehicle is going very fast, it can stop within a few meters, can't it?
