1.Every day in homes all over the world, people have lights on when no one is in room.

2.Air conditioners are usually set at too high temperatures in winter.

3.A lot of water is wasted by using too much.

4.We’ll have less and less gas to use. Because more and more people buy cars.

5.People especially children watch TV for too many hours.

A.  Take a shower instead of bath, for a bath uses twice as much water. Don’t flush(冲洗) toilet unnecessarily.

B.  Plant more trees and grass around our houses.

C.  Encourage people to do more outdoor activities in their free time. Get children to learn more from reading books.

D.  Always keep the saying in mind “ Turn off lights before leaving.”

E.  We should walk to work, ride a bike to school, take a bus home more often instead of driving cars.

F.  In room where you have an air conditioner, you can save electricity by cleaning the filter. A filter uses 30 percent more energy when it is dirty. Also, set the air conditioner at 25℃.