1, If we didn’t waste so much energy, our resources would last longer.
2, Electricity can be produced from any sources of energy.
3, Most of our electricity comes from coal, gas or oil and the use of nuclear power.
4, A lot of countries in the world are using solar energy.
5, You should reduce the amount of electricity your family uses.
6, Don’t forget to turn off the fan when you are out.
7, I suggest switching off the cassette player.
8, If we run out of oil, we will need other kinds of energy.
9, If we don’t control pollution, it will be too late soon.
10, We should keep our environment clean and fresh.
