#Dark

1 Coal is more expensive and more polluting thân 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 in 20 years ? 

4 I have visited Yaly hydroelectric power plant before 

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

6 You should swich off electrical appliances when you aren't in use 

7 People will used biogas for fuel in homes and for transport 

Nocopy 

@gladbach

1. Natural gas is cheaper and less polluting than coal

=>Coal is more expensive and more polluting thân natural gas .

2. We are trying to find cheap and clean and effective sourced of energy

=> We are looking for cheap and clean,and effective sources of energy .

3. Will solar and wind replace fossil fuels with in 20 years?

=>Will fossil fuels be replaced by solar and wind in 20 years ? 

4. This is the secound time I have visited Yaly hydroelectric power plant

=> I have visited Yaly hydroelectric power plant before .

5. They built the first hydroelectric power plant in Niagara Falls in 1879

=>  The first hydroelectric power plant was built in Niagara Falls in 1879 .

6. It' s a good idea to swich off electrical appliances when they aren't in use

=> You should swich off electrical appliances when you aren't in use .

7. Biogas will be used for fuel in homes and for transport

=> People will use biogas for fuel in homes and for transport .

@yin

#Victory