3. 这个卫生清扫日被认为是本市进行过的最大的清扫活动。

The Clean-Up Day was the biggest clean-up project this city has ever had.

2. 为了减少空气污染，我们应该乘公交或地铁，而不要开车。

cut down air pollution,we should take the bus or subway driving.

1. 您对解决这些问题有何看法？

What is your idea solving these problems?

() 4. Everyone in our class looks forward to a chance to work for the UN.

   A. have   B. having

   C. give

() 3. Remember  the book to the library when you finish  it.

   A. to return;to read

   B. returning;reading

    C.to return;reading

() 1. It's everybody's duty to protect the environment and everyone can in making the earth a better place.

   A. play a part

   B. play a game

   C. take a part

64. 长大成人grow

65. 和......一起 along  …

66. 赐予某人飞翔的翅膀give sb. wings fly

61. 对......负责任 be responsible  …

62. 在......前面ahead …

63. 分离；隔开separate …

57. 信任 believe

58. 获得......的奖品win a prize …

59. 首先 first all 

60. 渴望;渴求 be thirsty

53. 弄得一团糟make a

54. 遇到......的难题have a problem …

55. (时间) 过去go

56. 在某人的帮助之下 one's help