WASTE (noun)

a) when something is used in a way that is not useful or sensible, or when you use more of something than is necessary:

* be a waste of time/money/effort: My father thought college would be a complete waste of time.

b) materials that are left after you have used something, which you want to get rid of because you no longer need them: radio-active waste from nuclear power stations; recycling household waste;

c) go to waste if something goes to waste, it is not used and is wasted: A lot of the food ended up going to waste.

Exercise 8. Put prepositions into the gaps.

I. Pollution is a damage caused the environment harmful

Chemicals and waste. 2. Exhaust automobiles causes a large percentage

_ all air pollution. 3. Environmental pollution is one the most serious

Problems facing humanity today. 4. People also pollute their surroundings _ various other ways. 5. But pollution can be gradually reduced _

Several ways. 6. Large numbers people are now working to reduce

Environmental pollution. 7. Pollution___________ soil reduces the amount land

That is available growing food.

Exercise 9. Put the verbs in brackets into correct form.

All parts of environment (to relate) closely to one another. The study of the relationships among living things, and between living things and other parts of the environment, (to call) the ecology. Because of clause relationships, a kind of pollution that chiefly (to harm) one pat of the environment also (may, to affect) others. For example, air pollution (to harm) the air. But rain (to wash) out of the air and (to deposit) them on the land and in bodies of waters.