My teenage son Karl became withdrawn(内向的) after his father died. As a single 36   ,

I tried to do my best to talk to him, but the more I tried, the more 37    dulled away(使变低沉).

When his report card arrived during his junior year, it said that he had been absent 95 times from classes and had six falling 38  

for the year. In this way he would never graduate（毕业）. I sent him to the school adviser, and I even begged him. Nothing 39   .