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

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

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

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

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

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

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

If we go on …… electricity, we will have to pay a lot next month.

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

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

Nuclear energy is ……, but it is dangerous.

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

Wave energy is an ….. source of energy.

…. energy is produced by collecting sunlight and converting it into electricity.

In India, the demand for ….. has always been more than the supply.

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

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