61. 你在扔掉垃圾之前分类吗？Do you ______ the waste before ______ it ______?

60. Do you open a window _____ ______(而不是)turning on air conditioning?

59. 所以每个班收集可再用的垃并且为了再循环卖掉它。

So every class collects _______ waste, and sells it _____ _______.

58. 扔掉玻璃，纸，金属是浪费的。It’s _____ to ______ _______ glass, paper and metal.

57. 你什么写关于环境的文章？When are you goint to _______ ______ ________ education?

56. 我们刚收到一位新标准的读者的来信We’ve just _____ an email from a ______ of New Standard.

55.那意味着你可以顺便进去走访几分钟或都你愿意呆多久就呆多久。

　That means you can ______ _______ for a few minutes or ______ ______ ____ you like.

54. _______ _______首要的是 the Science Museum is free.

53.在那你可以解决问题尝试想法。There you can ______ things _____ and _____ ____ ideas.

52.他昨天 病了所以没参加运动会就不足为奇了。

He was ill yesterday. _____ ______ he didn’t take part in the sports meeting.