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Grade 10 Entrance Exam --> Exercise --> Fill in the blank

Fill in each gap with a suitable word or phrase:
types supplies substances Each implications include is oxygen


1. Air   the ocean we breathe. Air   us with oxygen which is essential for our bodies to live. Air is 99.9% nitrogen,  , water vapor and inert gases. Human activities can release   into the air, some of which can cause problems for humans, plants, and animals.
There are several main   of pollution and well-known effects of pollution which are commonly discussed. These   smog, acid rain, the greenhouse effect, and "holes" in the ozone layer.   of these problems has serious   for our health and well-being as well as for the whole environment.


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