5. Human is looking for a clean, cheap and ……………… sources of energy.
A. effective B. effect C. effectively D. effectiveness
6. Low energy light bulbs should be used to ……………… electricity.
A. spend B. buy C. convert D. save
5. Human is looking for a clean, cheap and ……………… sources of energy.
A. effective B. effect C. effectively D. effectiveness
6. Low energy light bulbs should be used to ……………… electricity.
A. spend B. buy C. convert D. save
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