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

Nuclear energy is ……, but it is dangerous.

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

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

….. 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.

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

Wave energy is an ….. source of energy.

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

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

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

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.

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