In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
A
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On arriving home, the boy told his parents about all the ______ which occurred in his dormitory.
In summer, she would sit in the garden enjoying the fresh air and the smell of the things she ______.
The hosts apologized for ______ that some of their guests might be vegetarians.
In 1900, the energy derived from burning petroleum was only four percent ______ of coal.