các từ:

Roofs

Garden

Non-polluting

Polluting

The moon

Are

Renewable

The sun

Solar energy is a long lasting source (0) of energy, and it can be used almost anywhere.To generate solar energy, we only need solar cells and (1)________! Solar cells can easily be installed on house (2)________, so we don’t need any new space. Compared to other (3) ________ sources, they also possess many advantages: wind and water power rely on turbines which (24)________noisy, expensive and which take up large space.Solar cells are totally silent and (25)________. As they have no moving parts, they require little maintenance and have a long lifetime.

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