阅读下面短文，并借助上下文内容，在空格里填上一个合适的单词，使短文合理通顺。One cool April 22 morning, people started the day as

阅读下面短文，并借助上下文内容，在空格里填上一个合适的单词，使短文合理通顺。
One cool April 22 morning, people started the day as usual. Yet it was not a normal day. What’s so special about April 22? The answer is simple. It is Earth Day. People all 【小题1】 the world celebrate this important day. The idea of having a special day to celebrate Earth began 【小题2】 the 1960s. Life was very different then. Few people talked or even thought about the environment. Most people had no idea 【小题3】 dirty our air and water were.

On April 22, 1970, twenty million Americans 【小题4】 part in the first Earth Day activities. They showed that people really did want to do something about the environment. Since then many countries have passed 【小题5】 to protect the air, water, land and animals.
The vehicles such as cars and buses must pass tests to make sure that they don’t cause too 【小题6】 pollution. Thanks to the laws, cars today release (排放) about half as many bad chemicals as cars did in 1970. As a 【小题7】 , the air is cleaner than it once was.
Rivers and lakes are also cleaner today than before. It’s a good thing. The Cuyahoga River in Ohio was so polluted 【小题8】 rubbish and oil on the river even caught 【小题9】 ! Today, the river is cleaner. It no longer burns. It’s healthy enough for birds, fish, and other animals.
Now the celebration has spread to other countries. More than 175 countries celebrate it each year. We should 【小题10】 our best to help keep our planet healthy.over / around

(答案→)over / around 解析：短文大意：这篇短文主要讲述了地球日的由来，以及环境污染对我们星球的伤害，告诉我们要行动起来保护我们的星球。【小题1】结合语境可知本句指的是，全世界的人都庆祝这个重要的日子。短语all over/all around到处,四处.故填: over / around 【小题2】结合语境可知本句指的是,这种活动开始于60年代.in表示在某个时间范围,故用介词I,在里面.n 【小题3】结合语境可知本句指的是，大部分人不知道我们的空气和水是多么的脏。故填how ，如何，怎样。 【小题4】结合语境可知本句指的是，在1970年4月22日，两千万美国人参加了第一次地球日活动。本句描述的是过去发生的动作，故用一般过去时态。短语take part in参加，故填过去式动词took。 【小题5】结合语境可知自从那时以来许多国家通过法律来保护空气，水，土地和动物。故填复数名词laws，法律。【小题6】结合语境可知本句指的是，不引起太多的污染。英语中pollution表示抽象含义，不可数，故填much，许多，大量。 【小题7】联系前一句描述，可知本句指的是，结果，空气比以前清新多了。短语as a result结果是，故填名词result，结果。【小题8】结合语境可知本句指的是，俄亥俄州的凯霍加河污染是如此严重，以至于上面的垃圾和油都引起来大火。短语so……that如此……以至于，故填that . 【小题9】联系下文It no longer burns.描述，可知本句指的是，垃圾和油起了火。故填名词fire，火。 【小题10】结合语境可知本句指的是，我们应该尽力让我们的星球保持健康。短语try / do one’s best do do sth尽力做某事，本句中should为情态动词，故填原形动词try/do.

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