Read the passage and choose the best answer.

There is now increasing concern about the world’s energy (23)____ , particularly about those involving fossil (24) ____. In less than a hundred years we shall probably exhaust all the present (25) ____ of oil and gas. The world’s coal (26) ____ should last langer but, once used, these cannot be renewed. It is important; therefore, that we should develop such (27) ____ sources of energy as solar energy as well as water and wind power.

23______________

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