II. Circle the best answer to complete each sentence

  1. We should reduce the use of _________ at home.

      A. electric                         B. electricity                           C. electrical                             D. electrify

  2. Waves will be used as an ___________ sources of energy.

      A. environmentally-friendly                                            B. environmental friend

      C. environment-friendly                                                  D. friendly environment

  3. What will happen if we ________ of non-renewable energy resources?

      A. exhaust                         B. run up                                 C. run out                                D. use up

  4. I hope scientists will come up with a __________ to the shortage of energy on Earth.

      A. cause                             B. result                                  C. way                                     D. solution

  5. Geothermal energy can be found in only some places of the earth. It comes from depth ______ the earth

      A. under                            B. inside                                  C. indoor                                 D. in

  6. Most energy nowadays comes from fossil fuels such as oil, coal, and natural gas. _________, burning fossil fuels causes pollution.

       A. Although                      B. But                                      C. However                             D. Despite

  7. We should place                on our roof for the heating and hot water.

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

  8. Nuclear power is not only expensive _________ dangerous to our environment.

      A. and                                B. but                                      C. but also                               D. enough

  9. At this time next week, people                another hydro plant in Dak Lak province.

      A. will be building             B. are building                        C. will building                       D. will build

  10. In the middle of the 21^st century, people in _________ countries will be using more renewable energy.

      A. developed                     B. developing                         C. underdeveloping               D. underdevelop

  11. I think that solar energy can be an ____________ source of energy in the near future worldwide.

      A. changeable                   B. non-renewable                  C. alternative                          D. new

  12. Sunlight is __________ into electricity by each solar cell in the panels.

       A. changed                       B. exchanged                          C. switched                             D. turned

  13. Energy sources are classified into two groups - renewable and nonrenewable.

       A. categorized                  B. catalogued                         C. identified                            D. regarded

  14. What ________if  carbon dioxide levels continue to increase?

       A. happens                         B. will happen                        C. will be happening              D. happen

  15. Carbon footprint is the __________ of carbon dioxide we produce with any action or activity.

 A. number                       B. quality                                C. amount                               D. level