根据短文内容,从A、B、C、D 四个选项中选出一个能正确填人相应空格内的最佳答案,并把答案填在答题卡上对应题目的位置。

In China, traffic keeps on the right. Cars, trucks, buses  42   bikes must all keep on the right side of the  43 . In most other countries, traffic   44   on the left. How can you   45   the roads safer?

  46   you cross the road, stop and look each side.  47   left, then right, and then look left again. Don’t cross the road if you aren’t sure whether the road is clear or not. Don’t   48   across the road.  49   is dangerous. If you   50   small children, old people, or blind people walking across the road, help   51  cross the road in safety. Helping others is a kind of virtue (美德) .

42. A. or        B. and       C. but        D. while

43. A. road       B. river      C. bridge      D. city

44. A. go        B. coming      C. leave       D. keeps

45. A. make       B. know       C. guess       D. see

46. A. Often       B. Before      C. During      D. As

47. A. Look       B. Turn       C. Walk       D. Across

48. A. run        B. jumping     C. smile       D. walk

49. A. There       B. It        C. This       D. Here

50. A. watch       B. look       C. read       D. see

51. A. her        B. him       C. them       D. me

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