Whether or not solar energy can save your money depends on many things. Where you live is one factor. The type of home you have is another. Things like insulation (建筑隔热材料), present energy costs, and the type of system you buy are 11. ____ factors.Using solar energy can help save our 12. ____ fuel. As you know, our supplies of oil and gas are very 13. ____ . There is just not enough on hand to meet all our future energy needs. And when Mother Nature says that's all, the only way we can 14. ____ hearing those words is by starting to save energy now and by using other sources, like the sun.We won't have to worry about the sun's 15. ____ out of energy for another several billion years or so. Besides being an endless source of energy, the use of the sun has other 16. ____ as well. The sun doesn't 17. ____ as many problems as other energy sources do. For example, fossil fuel plants add to the 18. ____ high pollution levels. With solar energy, we can cut down on our pollution problems.With all these good points, why don't we use more solar power? There are many reasons for this. The biggest reason is that there are 19. ____ sources of energy. All is changing now. Solar costs are starting to equal the costs of oil and electricity. It could soon grow to become a 20. ____ part of our nation's energy supply.A cause B already C added D previous E runningF precious G solve H cheaper I major J abundantK limited L available M cleaner N delay O advantages

Solar energy for your home is coming. Whether or not solar energy can save your money depends on many things. Where you live is one factor. The type of home you have is another. Things like insulation (建筑隔热材料), present energy costs, and the type of system you buy are 11. ____ factors.

Using solar energy can help save our 12. ____ fuel. As you know, our supplies of oil and gas are very 13. ____ . There is just not enough on hand to meet all our future energy needs. And when Mother Nature says that's all, the only way we can 14. ____ hearing those words is by starting to save energy now and by using other sources, like the sun.

We won't have to worry about the sun's 15. ____ out of energy for another several billion years or so. Besides being an endless source of energy, the use of the sun has other 16. ____ as well. The sun doesn't 17. ____ as many problems as other energy sources do. For example, fossil fuel plants add to the 18. ____ high pollution levels. With solar energy, we can cut down on our pollution problems.

With all these good points, why don't we use more solar power? There are many reasons for this. The biggest reason is that there are 19. ____ sources of energy. All is changing now. Solar costs are starting to equal the costs of oil and electricity. It could soon grow to become a 20. ____ part of our nation's energy supply.

A cause B already C added D previous E running
F precious G solve H cheaper I major J abundant
K limited L available M cleaner N delay O advantages