Choose the best answer: There is now increasing concern about the world's 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 world's coal reserves should last longer but, once used, these cannot (4)_______.It is important, therefore what 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. form 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