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There will be a solution to the __________of energy soon.

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He is the richest ____________ in our project.

Chọn từ đồng nghĩa với từ được in đậm

The alternative sources of energy like the sun and the wind are not only plentiful but also clean and safe.

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They carry out projects to reduce fossil fuel _________.

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People will __________ all the natural resources in the world.

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Oil is not a__________ source of energy because it cannot easily be replaced.

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A _________ is a short phrase/ word to remember and remind about something.