All of us use energy every day - for transportation, (21) ____________, heating and cooling rooms, manufacturing, lighting, and entertainment. The choices we make about how we use energy - turning machines off (22) ____________ we’re not using them or choosing to buy energy efficient appliances - impact our environment and our lives.

There are many things we can do to use less energy and use it more wisely. Two main ways to (23) ____________ energy are energy conservation and energy efficiency. Turning the light (24) ____________ when you leave the room and recycling aluminum cans are both ways of conserving energy. Energy efficiency is the use of technology that requires less energy to perform the same function. A compact fluorescent light bulb that uses less energy than (25) ____________ ordinary bulb to produce the same amount of light is an example of energy efficiency.

21. A. eating               B. drinking                  C. sleeping                  D. cooking

22. A. when                B. before                     C. after                                    D. while

23. A. store                 B. produce                  C. use                          D. save

24. A. off                    B. on                           C. in                            D. out

25. A. an                     B.a                               C. the                          D.x