Grade 7: Unit 10 - Word forms

Câu 1. Tidal energy is renewable, ____________and clean. (plenty)

Câu 2. Wind will be used as an ____________friendly sources of energy. (environment)

Câu 3. There are many ways will be used to solve the problem of _____________. (pollute)

Câu 4. Solar power can be used to ____________or cool our houses. (hot)

Câu 5. _______________, fossil fuels are harmful to the environment. (fortunate)

Câu 6. We should use them_________ and try to find out alternative sources of power. (economy)

Câu 7. Solar energy is____________, plentiful and clean. (renew)

Câu 8. I think that solar energy can be an___________ source of energy in the near future. (alter)

Câu 9. We should reduce the use of___________ at home. (electrical)

Câu 10. It’s a clean source of energy. Sailboats couldn’t move without this________. (powerful)