1.  Burning coal and oil .............release........... carbon dioxide that harms the environment.

     2.  Many families .............use........... biogas.

     3.  Using non-renewable energy sources ...........pollutes............. the environment.

     4.  Solar power can be ...........convert............. into electricity.

     5.  There ............will be............ a shortage of energy in the near future.

     6.  Producing biogas energy ............involve............ burning waste, and this may have bad impacts on the environments.

     7.  Coal is a non-renewable source of energy, because it cannot be easily ...........replace.............

     8.  The wind turns turbines to ............make............ energy.

 VI  Choose the correct answer (A, B, C or D).

     1.  The wind, the sun, and the wave are some types of .................. sources of energy.

          A. changeable       B. alternative        C. cheap               D. costly

     2.  Remember to .................. the lights before going to bed.

          A. turn                 B. turn on             C. turn off            D. stop

     3.  People will reduce energy .................. as much as possible.

          A. consume          B. consumption    C. expense            D. expenses

     4.  Nuclear power is expensive and dangerous .................. our environment.

          A. for                   B. to                     C. in                     D. with

     5.  Human is looking for a clean, cheap and .................. sources of energy.

          A. effective           B. effect                C. effectively        D. effectiveness

     6.  Low energy light bulbs should be used to .................. electricity.

          A. spend               B. buy                  C. convert            D. save

     7.  We must .................. the amount of water our family used every day.

          A. lower               B. reduce              C. lessen               D. narrow

     8.  At this time next month we .................. to Ha Long Bay for a holiday.

          A. will go             B. will going         C. will be gone     D. will be going

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

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

     10.         Fossil fuels are very common in our society but they .................. the environment.

          A. renew               B. provide            C. waste               D. pollute