题目

    As I thought about the various things l would teach Mekhi Eli, my son, I thought about how    41    I was for the lesson my father taught me, for which I am extremely appreciative.     This lesson wasn't    42    taught. It was accidental. It wasn't a conversation or shining example of what to do. It was a    43    —a costly mistake. There are things,     44    ,that are seldom learned    45    a mistake is made.     My father was my    46    hero, so it was pretty hard for me to accept their divorce (离婚). But that was nothing�以三条线段3，4，x－5为边组成三角形，则x的取值范围为________．