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V. Choose the word or phrase that needs correction.
Dis depicting
1. Fossil fuels are (A) useful and inconvenient (B), but (C) they pollute (D) the air.
2. Scientists and engineers (A) are using energy from (B)the wind to (C) generate electrical (D).
3. We are look (A) for more (B)natural resources such as (C) wind and solar (D) energy.
4. Coal, natural gas (A) and oil are (B)fossil fuels, and it is (C) non-renewable (D).
5. In (A) the early 1800s, American and European (B) factories use (C) water as a source of
energy (D).
6. People develop (A) ways of using (B) biomass as (C) an alternative (D) to fossil fuels now.
7. New technology can make (A) solar panels to able (B) to generate (C)electricity on cloudy (D) days.
8. Energy from (A) renewable resources puts (B) less (C) strain on the limitless (D) supply of fossil
fuels.
9. About ago two centuries (A), biomass in (B) the form of wood was (C) the major (D) source of
energy.
10. Today, new technologies are producing (A) ethanol to (B) trees, grasses (C), and crop (D) waste.
VI Fill in each blank with a word from the hox