根据短文内容及首字母提示，填写所缺单词，使短文意思完整。每空限一词。
Air is very important to everything that lives. But the air we breathe is g 小题1: dirty. People all over the world are looking for w 小题2: to make it clean again.
Have you ever watched the smoke from chimneys(烟囱) r 小题3: high in the air? Have you s 小题4:___ the smoke from cars and trucks on roads or the smoke from planes? The smoke is h 小题5: to everyone, especially old people and children. If we want to keep well and strong, we need to breathe f 小题6: air.
With more and m 小题7: factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p 小题8: .
Scientists have a小题9: found ways to stop or slow down some of the things that make the air dirty. They will not stop working u 小题10: we have clean air again.
小题1:getting
小题2:ways
小题3:rising
小题4:seen
小题5:harmful
小题6:fresh
小题7:more
小题8:pollution
小题9:already
小题10:until
题目分析：本文叙述了空气正在被污染，变得越来越脏。脏的空气对人们的身体健康有害。为了健康强壮的身体，我们需要呼吸新鲜的空气。但是，随着到处越来越多的工厂，越来越多的汽车，卡车和飞机。空气污染越来越严重。科学家已经找到了办法阻止或减缓一些使空气变脏的事物。
小题1:句意：但是我们呼吸的空气正在变脏。根据People all over the world are looking for w 72 to make it clean again.可知空气变脏了。故此处用getting。
小题2:句意：世界各地的人正在寻找方法使空气再变得干净，look for ways to do sth. 寻找方法做某事。
小题3:句意：你曾经见过从烟囱里冒出的烟升到高空吗？watch sb./sth. doing 看见......正在做......。结合句意，烟应该向上升。故此处为rising。
小题4:句意：你看见过路上汽车或卡车冒出的烟吗？根据Have you ever watched the smoke from chimneys(烟囱) r high in the air? 可知此处是指看到汽车或卡车里冒出的烟。又因此处用现在完成时，故用过去分词seen。
小题5:句意：那些烟对每个人都有害。be harmful to对......有害，故此处为harmful。
小题6:句意：为了保持身体健康和强壮，我们需要呼吸新鲜空气。根据If we want to keep well and strong,可知身体要健康，应该呼吸新鲜空气，故此处为fresh。
小题7:句意：随着到处越来越多的工厂，越来越多的汽车，卡车和飞机。more and more 越来越多。
小题8:句意：处理空气污染变得越来越难。根据With more and m factories everywhere and more and more cars, trucks and planes可知他们排除的烟越来越多，空气污染越来越严重。air pollution空气污染。
小题9:句意：科学家已经找到了办法阻止或减缓一些使空气变脏的事物。用于现在完成时，故此处用副词already。
小题10:句意：知道我们再次有干净的空气，他们才停止工作。 not ......until.......“直到......，才.......。”