Đáp án:

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 the sun! Solar cells can easily be installed on house roofs, so no new space is needed and each user can quietly generate their own energy. Compared to other renewable sources, they also possess many advantages. Wind and water power rely on turbines `which` are noisy, expensive and easy to break down. Solar cells are totally silent and non-polluting. As they have no moving parts, they require little maintenance and have a long lifetime. `Besides`, solar energy also has some disadvantages. We can only generate solar energy during daytime because the system depends on sunlight. Besides, solar cells require large area to work effectively. The main disadvantage of solar energy is that it costs about twice as much as traditional sources such as coal, oil, and gas. This is because solar cells are expensive. Scientists are hoping that the costs of solar cells will reduce as more and more people see the advantages `of` this environmentally friendly source of energy. 

⇒ Which là một đại từ quan hệ, được dùng để nối tiếp 2 vế câu hoặc thay thế một đại từ xưng hô nào đó.

⇒ Besides nghĩa là bên cạnh đó, đồng nghĩa: also, on the other hand,... tất nhiên sẽ có rất nhiều từ phù hợp để thay vào đó nhưng tớ nghĩ từ này cũng đã có thể thể hiện được vốn từ vựng của mình.

⇒ See+sth+of+sth: thấy điều gì đó của vật, thứ gì đó.

Chúc bn hok tốt!!!

`giahan27511`

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 the sun! Solar cells can easily be installed on house roofs, so no new space is needed and each user can quietly generate their own energy. Compared to other renewable sources, they also possess many advantages. Wind and water power rely on turbines which are noisy, expensive and easy to break down. Solar cells are totally silent and non-polluting. As they have no moving parts, they require little maintenance and have a long lifetime. However , solar energy also has some disadvantages. We can only generate solar energy during daytime because the system depends on sunlight. Besides, solar cells require large area to work effectively. The main disadvantage of solar energy is that it costs about twice as much as traditional sources such as coal, oil, and gas. This is because solar cells are expensive. Scientists are hoping that the costs of solar cells will reduce as more and more people see the advantages of this environmentally friendly source of energy. 

cho c xin ctlhn nha