阅读下面材料，用不多于1个单词的正确形式填空

It’s very important  61  we all recycle. In nature, everything is  62  (use) again.  63  example, when  64  (a) animal dies, it becomes another animal’s food. Nothing is wasted. But humans have created things like plastic bags  65  can’t be broken down(分解) by nature. Our rubbish kills animals and pollutes water and soil. If we continue making too much rubbish, the problem will only get worse. If nature can’t reuse the rubbish, we must recycle it. We should clean up the rubbish we’ve  66  (make) because nature can’t.

Recycling is also the  67  (rightly) thing to do for another reason. The earth is rich in natural materials like water and  68  (tree), but these materials are not endless. We use up our natural materials much  69  (fast) than the earth is able to reproduce(再生）them.

Recycling can help us save the earth,  70  let’s take action（采取行动） right now.

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【考点】主语从句，一般现在时，动词被动语态，介词，不定冠词，限制性定语从句，关系代词的用法，现在完成时，形容词，可数名词及其单复数，副词比较级，从属连词

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