Completar frases Text energyVersión en línea Fill in the gaps, choose the correct answer por Анна Пак 1 great cause hydro solar important This problem is very . 2 free work cause energy important The sun is a source of energy . 3 work use use free popular People coal to produce electricity . 4 panel cause change coal work Solar panels best in sunny places . 5 work important use change cause Wind turbines wind energy into electrical power . 6 free cause power plant solar Wind turbines no pollution .
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