阅读下面短文，掌握其大意，然后从各题所给的四个选项（A、B、C和D）中，选出最佳选项。
I never thought I would be a “runner”. I was the girl who 1 slowest in the PE class. A few years ago, I was walking with a group of 2 in the Race for the Cure, a 5km race designed to 3 money for the fight against breast cancer(癌), 4 one lady caught my 5 .
She was one of the weakest-looking women I've ever seen. She must have been close to seventy years old, 6 a T-shirt with the word “Survivor”. She was so small that it seemed as if she could even be 7 by a strong wind. But, she was running. And she was 8 me and my group of friends. She ran slowly, but 9 —as if each step pushed her cancer further into her past. Right at that moment, I10 that in the next Race for the Cure, I'd be running along with her.
A week later, I found myself in the 11 , running on the treadmill(跑步机). Three minutes after I started, my face was bright red. I felt like my lungs were going to burst. I 12 slow down to a walk. I thought of the 13 at the race. I kept it up. I was able to go a little 14 each time. Three and a half minutes. Four minutes. Five.
A year later, I was 15 at the Race for the Cure, but this time, I 16 with the runners. When the race started, the other runners passed me by. I ran forward. I wondered if I'd be 17 to do it. But then, I remembered the brave woman. I ran as fast as I could until I finally crossed that finish line. I had just 18 my first race! I 19 down at my legs, amazed. They had done something I'd never thought 20 . I have never felt stronger than at that moment. And, I knew that I wanted to do it again.
