Chọn những từ => roofs , non – polluting , of , are , renewable để điền vào các số S

Chọn những từ => roofs , non – polluting , of , are , renewable để điền vào các số
Solar energy is a long lasting source(1) __________ energy, and it 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 (2) __________ Compared to other (3) __ _______ sources, they also possess many advantages: wind and water power rely on turbines which (4) __________ noisy, expensive and which take up large space. Solar cells are totally silent and (5). __________ As they have no moving parts, they require little maintenance and have a long lifetime.
1) __________ 2) __________ 3) _________ 4) _________ 5) _________