阅读下面短文，从短文后各题所给四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑

    One day, I drove into a service station to get some gas. It was a beautiful day and I was feeling1. As I paid for the gas, the attendant said, “How do you feel?” that seemed like a2question, but I felt fine and told him so. “You don't look 3.” he replied and continued to tell me my skin appeared 4.

    By the time I left, I was a little 5. About a block away, I 6 to the side of the road to look at my face 7the mirror. Was everything all right? Had I picked up 8rare disease? By the time I got home, I was beginning to feel a slight 9somewhere in my body.

    The next time I went into that gas station, I 10 what had happened: The place had recently been painted a bright, bilious yellow, and the light reflecting off the walls made everyone inside 11as though they were sick! That was the truth. 12, I let that short conversation change my attitude for an entire day. His 13 observation affected the way I felt and acted.

    This experience made me think a lot. It is the same with life, in which attitude 14. The way we look at life determines how we feel and how we 15. If we expect something to turn out16, it probably will. But 17 also works in reverse. If we expect good things to happen, they 18do. An optimistic attitude, I believe, is not a luxury but a(an)19. So after that, I chose to highlight the 20throughout the rest of my life.