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.
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