`0.` Despite the heavy rain, he still went to school.

`1.` Coal is more expensive and more polluting than natural gas.

`2.` We are looking for cheap and clean and effective sources of energy.

`3.` Will fossil fuels be replaced by solar and wind within 20 years?

`4.` I have visited Yaly hydroelectric power plant twice.

`5.` The first hydroelectric power plant was built at Niagara Falls in 1879.

`6.` You should switch off electrical appliances when they aren't in use.

`7.` Despite being the most polluting of fossil fuels, coal is still the largest source of energy worldwide.

`8.` People will use biogas for fuel in homes and for transport.

0. Despite the heavy rain, he still went to school

1. Coal is more expensive and more polluting than natural gas.

2. We are looking for cheap and clean and effective sources of energy.

3. Will fossil fuels be replaced by solar and wind within 20 years?

4. I have visited Yaly hydroelectric power plant two times

5. The first hydroelectric power plant was built at Niagara Falls in 1879.

6. You should switch off electrical appliances when they aren’t in use.

7. Despite being the most polluting of fossil fuels, it is still the largest source of energy worldwide.

8. People will use biogas for fuel in homes and for transport.