…. can be an excellent source of free, renewable energy for poor farmers.

….. source of energy is the source that can’t be replaced after use.

“Why is it called a …… source?” - “Because it can be replaced easily and quickly.”

We must ….. the amount of water our family use every day.

Wave energy is an ….. source of energy.

Low energy light bulbs should be used to ….. electricity.

Someone’s carbon …. is a measurement of the amount of carbon dioxide that their activities produce.

Several governments try to …. the use of fossil fuels.

Choose the best one (A, B, C or D) to complete the sentence

Nuclear energy is ……, but it is dangerous.

There are many available ….. power sources in Vietnam including sun, wind, water, etc.

Remember to ….. the lights before going to bed.

Biogas is ….. and cheap for cooking and heating.

When you save energy, you not only save money, you also reduce the demand for …… such as coal, oil, and natural gas and that is a great way to play a part in saving the planet.

The government has warned that Britain will face power ….. in the coming winters.

We should put ….. on our roof for the heating and hot water.

Laos and Cambodia have big plans for building up to 11 …… on the lower Mekong.