阅读短文掌握其大意，然后从每小题所给的四个选项中选出一个最佳答案。Last night I was driving from Harrisburg to Lewisburg ,a distance of about 80 miles. It was late, and I was driving 　36　.At one point along an open highway, I came to a crossroad with a traffic light. I was 　37　on the road by now, but as I came near the light, it turned 　38　and I braked to a stop. I looked left, right,and behind me. Nothing. Not a car, no suggestion(迹象）of headlights(车灯),　39　there I sat, waiting for the light to 　40　, the only human being,for at least a mile in any 　41　.I started wondering why I 　42　to run the light. I was not afraid of being caught, because there was 　43　 no policeman anywhere around and there certainly would have been no 　44　in going through it.Much later that 　45　, after I' d met with a group in Lewisburg and had climbed into bed near midnight, the question of why I' d stopped for that light 　46　me. I think I stopped 　47　 it’s part of a contract(契约）we all have with each other. It ’ s not only the law, but it's an agreement we have, and we trust each other to follow 　48　: we don’ t go through red lights.We do 　49　 we say we’ll do. We show up when we say we' 11 show up. I was so 　50　 of myself for stopping for that red light. And as no one would ever have known what a good person I was on the road from Harrisburg to Lewisburg, I had to tell someone. 36. A. fast B. slowly C. carefully D. hard 37. A. late B. alone C. worried D. afraid 38. A. green B. yellow C. red D. dark 39. A. and B. or C. so D. but 40. A. return B. change C. start D. continue 41. A. attention B. background C. direction D. information 42. A. refused B. decided C. prepared D. forgot 43. A. hardly B. luckily C. usually D. clearly 44. A. danger B.excuse C.space D.energy 45. A. moment B. night C. afternoon D. morning 46. A. depended on B. looked forward to C. looked forward to D. came back to  47. A. though B. unless C. because D. until 48. A. me B. it C. him D. us 49. A. what B. how C. why D. That 50. A. tired B. ready C. proud D. sorry