III
Solar energy is a long lasting source of energy which can be used almost anywhere. To generate solar energy, we only need solar cells and (1) the sun! Solar cells can easily be installed on house (2) roofs, so no new space is needed and each user can quietly generate their own energy. Compared to other (3) renewable sources, they also possess many advantages. Wind and water power rely on turbines which (4) are noisy, expensive and easy to break down. Solar cells are totally silent and (5) non-polluting. As they have no moving parts, they require little maintenance and have a long lifetime.
Writing
I
1, Renewable energy will be used in the future.
