People are often killed when they  16  the road.Most of these people are old people and children.Old people are often killed because they can not see  17   hear very well.Children are often killed because they are not  18  .They forget to look and listen  19  they cross the road.

A car��truck or bus can not stop very  20  .If the car is going very fast��it will travel many meters before it stops.People don't always understand this.They think a car can stop  21   a few meters.The faster a car is traveling��the longer it takes to stop.It is very  22  for a person to know how fast a car is traveling. 

The  23  safe way to cross the road is to look both ways��right and left.Then  24  the road is clear��it is safe to cross.The right way to cross the road is to walk quickly.It is not  25  to run across the road.If people run across the road��they may fall down. 

16.A.over               B.across           C.cross             D.through  

17.A.and            B.but             C.both              D.or  

18.A.care               B.careful          C.strong            D.healthy  

19.A.before          B.after               C.since             D.for  

20.A.ate            B.early            C.quickly               D.slowly  

21.A.during             B.among           C.between           D.in  

22.A.easy               B.difficult         C.busy              D.trouble  

23.A.few           B.only               C.often             D.always  

24.A.if             B.before           C.which            D.what  

25.A.hard               B.danger          C.safe              D.dangerous  

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