阅读下面的短文，在短文的空格内填入适当的词，使其内容通顺。

About three years ago, I felt very lonely. I didn’t like my classmates, my parents or anyone else. My classmates didn’t want to talk with me and my parents were always saying that other kids were better than me. I thought I was the   小题1:  unlucky(不幸运的) person in the world.

One day I had a big fight with one of my classmates. I was so angry that I hit him in the face. Just at that moment, a boy stood up and stopped the fight. He was the monitor(班长) of our class.

After that, he often helped me and we became good   小题2: . Whenever I got angry or sad, he would help   小题3: to cool down(冷静). My life began to change because of the boy, my best friend. We   小题4:  a lot of time on interesting days together. As time goes by, I have become happier with people and things. And it seems that people around me have changed, too. My parents don’t shout at me any more. And my classmates become friendly to me.

But now I can’t often see my best friend小题5:he is seriously ill and is staying in hospital. How I miss the days when we were together! I hope he will be all right and come back to school soon.

为了使勘察、设计、施工、材料设备供应单位和工程监理企业依法履行各自的责任和义务，在工程建设中必须实行（　　）。

A．建设工程监理制

B．工程招标投标制

C．项目法人责任制

D．合同管理制