题目内容：

I teach economics at UNLV. Last Monday, at the beginning of class, I cheerfully asked my students how their weekend had been. ____1.____He then asked me why I always seemed to be so cheerful.

His question reminded me of something I’d read somewhere before: “Every morning when you get up, you have a choice about how you want to approach life that day,” I said.“____2.____”

“Let me give you an example,” I continued. This university is 17 miles down the freeway from where I live. One day I only had to drive another quarter mile down the road to the college. ____3.____I tried to start it again, but the engine wouldn’t turn over. So I put my flashers on and marched down the road to the college.”

“As soon as I got there .I arranged for a tow truck to meet me at my car after class. A teacher asked me what had happened. ‘This is my lucky day,’ I replied, smiling at her. ‘____4.____What do you mean?’ She continued to ask. ‘I live 17 miles from here. My car could have broken down anywhere along the freeway. It didn’t. Instead, it broke down off the freeway, within walking distance of here. I’m still able to teach my class and arrange for the tow truck to meet me after class. I explained to her. ”

“Her eyes opened wide, and then she smiled. ____5.____” So ended my story.

I scanned the sixty faces. Despite the early hour, no one seemed to be asleep. Somehow, my story had touched them. In fact, it had all started with a student’s observation that I was cheerful.

A. I choose to be cheerful.

B. You’re your own master.

C. But just then my car died.

D. I smiled back and headed for class.

E. One’s life depends on one’s attitude.

F. Your car breaks down and today is your lucky day?

G. One young man said that his weekend had not been so good.