One of the responsibilities of the Coast Guard is to make sure that all ships______followtraffic rules in busy harbors.
A、convenientlyB
暂无解析
In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
Thehostsapologizedfor______thatsomeoftheirguestsmightbevegetarians.
Thesuspectcooperatedfullywiththepolicewhen______abouthisroleintheincident.
Hecomplainedtothebooksellerthattherewereseveralpages______inthebook.
Notallbirdscanfly,______doallbirdsbuildnests.
