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Energy will be one of the defining issues of this century. One thing is clear: the era of (1) o...

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one-fifth  all  used  are  
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Getting off to work with a minimum effort helps save one's energy.  Dr. Kleitman explains why people reach their peaks at different hours of day.  Habit helps a person adapt to his own energy cycle.  Children have energy cycles, too.  
one tenth  one millionth  all that comes from the surface of the sun  a very small portion  
what  something  anything  that  
by which    by that    through which    through that  
one tenth  one millionth  all that comes from the surface of the sun  a very small portion  
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assemble  gather  generate  yield  
one tenth  one millionth  all that comes from the surface of the sun  a very small portion  
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Getting off to work with a minimum effort helps save one's energy.  Dr. Kleitman explains why people reach their peaks at different hours of day.  Habit helps one adapt to his own energy cycle.  Children have energy cycles, too.  
Getting off to work with a minimum effort helps save one's energy.  Dr. Kleitman explains why people reach their peaks at different hours of day.  Habit helps a person adapt to his own energy cycle.  Children have energy cycles, too.  
to include    including    included    being included  
you will lose more weight running one mile than walking the same distance  you will use more energy walking one mile than running the same distance  for the same distance the faster you walk, the more energy you will use  whether you run one mile or walk the same distance, you use the same energy  

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