There is now increasing concern about the worlds energy (1) , particularly about those involving fossil (2) . In less than a hundred years we shall probably use up all the present (3) of oil and gas. The worlds coal reserves should last longer but, once used, these cannot (4) . It is important, therefore, that we should develop such (5) sources of energy as solar energy as well as water and wind power, classed as renewable energy.
1. A. possessions B. resources C. goods D. materials
2. A. fuels B. powers C. forms D. energies
3. A. findings B. productions C. amounts D. sources
4. A. updated B. repeated C. renewed D. produced
5. A. traditional B. alternative C. revolutionary D. Surprising
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