填空。 The yearly Marathon (马拉松) in my town usually happened during a heat wave. My job was to follow behind _1_ in an ambulance (救护车) in case any of them needed medical attention. 'We're supposed to stay behind the last runner, so drive it _2_ ,' I said to the driver, Doug , as the race started. The front-runners started to _3_ and then my eyes were drawn to the woman _4_ blue silk running shorts and a white T-shirt. We knew we were already watching our 'last runner.' Her _5_ were so crippled (残疾的) that it seemed almost impossible for her to be able to walk, let alone run a marathon. Doug and I _6_ in silence when she slowly moved forward. Finally, she was _7_ runner left in sight. Tears streamed down my face when I watched with respect as she pushed forward with great determination through the last miles. When the finishing line came into sight, rubbish was everywhere and the _8_ crowds had long gone home. __ 9_ , standing straight and ever so proud stood a lone man. He was holding one _10 of a ribbon (缎带)of crepe paper (皱纹纸) tied to a post (标杆). She slowly crossed through, leaving _11_ ends of the paper fluttering (飘扬) behind her. I do not know this woman's name, but that day she became part of my 12 _ a part I often depend on. For her, it wasn't about 13_ the other runners or winning a prize, but about finishing _14_ she had set out to do, no matter what. When I think things are too difficult or I get those 'I-just-can't-do-it,' I think of the last runner. Then I realize how _15_ the task before me really is. (     )1. A. the runners (     )2. A. happily (     )3. A. run (     )4. A. by (     )5. A. hands (     )6. A. drove (     )7. A. the only (     )8. A. tiring (     )9. A. Besides (     )10. A. end (     )11. A. either (     )12. A. dream (     )13. A. following (     )14. A. what (     )15. A. difficult B. the drivers B. slowly B. go B. with B. legs B. looked at B. the next B. waiting B. And B. part B. both B. study B. hoping B. that B. boring C. the crowds C. quickly C. disappear C. for C. arms C. watched C. the first C. cheering C. However C. beginning C. each C. idea C. running C. how C. easy D. the volunteers D. quietly D. appear D. in D. body D. walked D. the back D. patient D. But D. start D. neither D. life D. beating D. why D. hard