Give the correct form of the word given to complete the sentences. 1. Tidal energy is renewable, ____________and clean. (plenty) 2. Wind will be used as an ____________friendly sources of energy. (environment) 3. There are many ways will be used to solve the problem of _____________. (pollute) 4. Solar power can be used to ____________or cool our houses. (hot) 5. _______________, fossil fuels are harmful to the environment. (fortunate)

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