In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
A
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Inordertobuyanewcar,youshouldatleast______onehundreddollarsaweek.
______thepopularityofrobotsinJapan,thecountry’srobot-productiongrowthisslowingdown.
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.