综合填空：用方框内所给词的适当形式填空，使短文意思完整、正确。（每小题1分）

quickly, while , clear, meter, walk, across，both，careful, wait, understand

Many people die from accidents every year. Nowadays road accidents happen very often. People are often killed   66  crossing the road. Most of these people are old people and children. Old people are often killed because they usually cannot see or hear very well. Children are often killed because they are not   67 .
A car, a truck or a bus cannot stop very   68 . If it’s running very fast, it will travel many meters before it stops. People don’t always   69  this. They think a car can stop in a few   70 . The faster a car traveling, the longer it takes to stop.
The only safe way to cross the road is to look   71  ways, right and left. Then if the road is   72
it is safe to cross. The right way to cross is to   73   quickly. It’s dangerous to run. If people run   74
the road, they may fall down.
Besides, we can’t cross the road when the traffic light is red. We must   75  till the light is green. If old people have trouble in crossing the road, young ones should try their best to help them.