根据短文内容及首字母提示，填写所缺单词，将答案按序号填入下面表格内。 Air

问题：

根据短文内容及首字母提示，填写所缺单词，将答案按序号填入下面表格内。

     Air is very important to everything that lives. But the air we breathe is g   1   dirty. People all over the world

are looking for w  2   to make it clean again.

     Have you e   3   watched the smoke from chimneys rising high in the air? Have you s   4   the smoke from

cars and trucks on roads or the smoke from planes? The smoke is not g   5   to breathe. If we want to keep

well and strong, we need to breathe c  6   air.

     W   7   more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p  8  .

     Scientists have a   9   found ways to stop or slow down some of the things that make the air dirty. They

will not stop working u  10   we have clean air again. We hope our environment will be better and better.