1. Why wasn’t Katie worried about her children playing in the street?
　　

　　2.How did the engine drivers and conductor react when they realized that there were children on the tracks?
　　

　　3 .What made Katie realize that something must be wrong with her children?
　　

　　4.How did Falzo rescue the two children?
　　

　　5 .What can we learn from the story?