Homing pigeon is useful as a ______ carrier because when taken from home, it will return atthe first opportunity.
A、meaningC
暂无解析
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
On arriving home, the boy told his parents about all the ______ which occurred in his dormitory.
Thesuspectcooperatedfullywiththepolicewhen______abouthisroleintheincident.
One of the responsibilities of the Coast Guard is to make sure that all ships______followtraffic rules in busy harbors.
The suspect cooperated fully with the police when ______ about his role in the incident.
