6.         source of energy is the source that can’t be replaced after use.

            A. Effective                B. Non-renewable       C. Renewable              D. Natural

      7.   Which of the following is NOT renewable source of energy?                              

            A. wind                       B. coal                         C. hydro                      D. solar

      8.   We are looking for cheap, clean and             sources of energy.

            A. serious                    B. dangerous               C. effective                 D. efficient

      9.   By the middle of the 21st century, people in developing countries              more renewable energy.

            A. used                        B. have used               C. uses                        D. will be using

      10. If we go on                   electricity, we will have to pay a lot next month.

            A. turning on B. widened                               C. wasting                   D. increasing

      11. Biogas is                      and cheap for cooking and heating.

            A. serious                    B. expensive               C. plenty                     D. abundant

      12. We should put             on our roof for the heating and hot water.

            A. equipment              B. cracks                     C. solar energy           D. solar panels

      13. In many countries, people think that electricity, gas and water are not luxuries but                                   .

            A. necessities              B. appliances              C. sales                       D. consumers

      14. We should use             light bulbs in our homes.

            A. a bit energy            B. efficient                  C. low energy             D. little energy

      15. A hydropower station             in the North of the country next year.