题目内容：

完形填空,阅读下面的短文，掌握其大意，然后从短文后各题所给的A、B、C、D四个选项中选出可以填入相应空白处的最佳答案。

A

Every day some people are killed while they are crossing the roads． ________ of these people are old people and children．Old people are often killed because they can't see or hear very well．Children are killed because they are not ________ ．They forget to look and listen before they ________  the roads．

A car or a bus can't stop quickly．If a car is going very fast, it will travel many meters before it stops．Some people don't always understand this．They think a car can stop in a few meters．It is difficult to________ how fast a car is moving．The only way to cross the roads safely is to look both ways, right and left．Then if the roads are ________, you can cross them．

1.A．Much          B．Most           C．More           D. Least

2.A．care          B．carefully      C．careful       D. careless

3.A．across        B．come           C．cross         D. walk

4.A．know          B．look          C．listen        D. hear

5.A. full         B. empty          C. busy           D. free