There’s now increasing concern about the world's energy resources, particularly about those involving fossil (41)__about_____. In less than a hundred years we shall probably (42) exhaust all the present sources There’s now increasing concern about the world's energy resources, particularly about those involving fossil (41)_______. In less than a hundred years we shall probably (42)_______ all the present (43)_______ of oil and gas. The world's coal (44)_______ should last longer but, once used, these can not be (45)_______It is important, therefore, that we should develop such (46)_______ sources of energy as solar energy and nuclear energy as well as water and wind (47)_______ (classed as (48)_______ energy). Until these energy (49)_______ are widely used, it is important for the developed countries to reduce energy (50)_______ as much as possibles_____ of oil and gas. The world's coal (44)_____mines__ should last longer but, once used, these can not be (45)_______It is important, therefore, that we should develop such (46)_______ sources of energy as solar energy and nuclear energy as well as water and wind (47)_______ (classed as (48)_______ energy). Until these energy (49)_______ are widely used, it is important for the developed countries to reduce energy (50)_______ as much as possible
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