阅读下面短文，根据提示在每个空格内填入一个适当的单词。

Keeping Safe on the Street

Every year many people get hurt or /lu:z/  their lives in traffic accidents. How can we keep（安全）  when we are walking on the street? First, we must obey the traffic rules. We can /krɔ:s / the street only when we see the green "walk" sign. Second,  we cross the street, we must stop and look both ways—look left, look right and look left again. , we must never play on the street. Last, it's good to help children and old people cross the street. All of us should be very （小心的） when we are walking on the street.