[解析]
71.example．细节理解题．根据第一段中Let's say you are taking a walk along the road and you happen to see one or two waste bottles lying on the grass beside the road． What would you do？可知假设你在路上散步，碰巧看到路边的草地上有一两个废瓶子，你会怎么做？因此可知作者是通过举例子来开始这篇文章的．故答案为：example．
72.three．根据第二段中You may have different choices． Firstly，…Secondly，…Thirdly，…可知你可能有不同的选择．首先，…第二，…第三，…因此可知在第二段中总共有三个选择．故答案为：three．
73.helpful．细节理解题．根据第二段中 you're also developing yourself to be a person who would think of others and help them．可知你也在把自己培养成一个会为他人着想的人帮助他们．故答案为：helpful．
74.country/city．词义猜测题．根据文中 you can pick them up and throw them into a dustbin （垃圾箱）． By doing this，you have walked a step further to help make our home clean．可知你可以把它们捡起来扔进垃圾箱这．这样做，你就更进一步了，有助于使我们的家变得干净．根据前后文含义可知此处home指的是我们的国家或者城市．故答案为： country/city．
75.waste bottles．细节理解题．根据文中 Firstly ，you can leave the bottles there as they are． Secondly， you can pick them up and throw them into a dustbin （垃圾箱）． By doing this，you have walked a step further to help make our home clean． Thirdly， you might want to pick them up and give them to an old man or woman who collects waste for a living．可知首先，你可以把瓶子放在原处…其次，你可以把它们捡起来扔进垃圾箱…第三，你可能想把它们捡起来，交给一个以收集垃圾为生的老人或女人…因此可知本文作者主要用废瓶子的一个例子来支持这个观点．故答案为：waste bottles．
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