Not all birds can fly , ______ do all birds build nests.
B
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In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
Inordertobuyanewcar,youshouldatleast______onehundreddollarsaweek.
On arriving home, the boy told his parents about all the ______ which occurred in his dormitory.
I know my limitations, so I won ’t do anything ______ my ability.
The suspect cooperated fully with the police when ______ about his role in the incident.