In1900,theenergyderivedfromburningpetroleumwasonlyfourpercent______ofcoal.
A
暂无解析
______wecanhopeforistoavoidcompletefailureinthecominggamewiththatstrongteam.
Inordertobuyanewcar,youshouldatleast______onehundreddollarsaweek.
Manypatientsinsistonhavingwatcheswiththeminhospital,______theyhavenoschedulestokeep.