Question

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1, Although solar panels are quite expensive to install, youll save money on electricity in the end. (but)

=> Solar panels

2, China is the largest producer of wind power in the world.

=> China produces

3, Natural gas is cheaper and less polluting than coal.

=> Coal is

4, We are trying to find cheap, clean and effective sources of energy.

=> We are looking

5, I'm going to  buy a hybird car because it doesn't use as much gas as other cars. (less)

=> I'm going to

Answer 1

1  are quite expensive to install, but you'll save money on electricity in the end.

2 the largest wind power in the world

3 more expensive and more polluting than natural gas

4 for cheap, clean and effective sources of energy.

5 buy a hybird car because it uses less gas than other cars