If you made a listof all the jobs performed by the different kinds of energy,you would fill manypages.

Nuclear energy isused in some areas of the United States.But there are dangers.Waste materialsfrom nuclear______(51)would destroy life if they leaked______(52)the

land.When nuclearenergy is produced,a lot of______(53)is produced,too,50 a flow of lake or oceanwater 15 used to cool the operations.Then the water______(54)to its

source.If thereturning water were too hot,it would destroy fish and other______(55).

Cow manure is beingused to produce a kind of______(56).The manure from farms is put into a machineto convert it to a liquid.Then the gas 15 formed______(57)a natural

process.If theconverter were not 50______(58)at the present time,it would be used in manyplaces to provide______(59).

Garbage has becomean energy source.It______(60)to oil,steam,or electricity,or it is used on theland.

Butrecent______(61)about power supplies has led to increased interest in the useof wind______(62)a source of electrical power.Windmills are clean andthey______(63)no

waste.And they usea______(64)resource.Some scientists consider that wind energy systems canfulfill a valuable______(65)in meeting the energy needs of industrialized

nations and of thedeveloping world._________(57)

A.by

B.through

C.with

D.from