完形填空。 The yearly Marathon in my town usually happened during a heat wave. My job was to follow behind the runners in an ambulance (救护车) 1 any of them needed medical attention. 'We're supposed to stay behind the 2 runner, so take it slowly,' 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 in blue silk running shorts and a loose white T-shirt. We knew we were already watching our 'last runner.' Her 4 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 watched in silence as she slowly moved forward. 5 , she was the only runner left in sight. Tears streamed down my face when I watched with respect 6 she pushed forward with great determination through the last miles. When the finish line came into sight, rubbish lay everywhere and the 7 crowds had long gone home. Yet, standing straight and ever so proud 8 a lone man. He was 9 one end of a ribbon (缎带) of crepe paper (皱纹纸) 10 to a post. She slowly crossed through, leaving both ends of the paper fluttering behind her. I do not know this woman's name, but that day she became part of my 11 - a part I often depend on. For her, it wasn't about 12 the other runners or winning a prize, but about 13 what she had set out to do, no matter 14 . 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. so that (     )2. A. first (     )3. A. run (     )4. A. hands (     )5. A. Quickly (     )6. A. since (     )7. A. tired (     )8. A. stood (     )9. A. helping (     )10. A. kept (     )11. A. dream (     )12. A. following (     )13. A. finishing (     )14. A. where (     )15. A. difficult B. in case B. best B. separate B. legs B. Unluckily B. before B. waiting B. waited B. catching B. tied B. feeling B. hoping B. realizing B. how B. interesting C. even though C. only C. disappear C. arms C. Naturally C. as C. cheering C. came C. holding C. connected C. idea C. encouraging C. starting C. when C. easy D. only if D. last D. appear D. body D. Finally D. until D. impatient D. had D. tying D. led D. life D. beating D. winning D. what D. hopeful