After so many days without rain, the ground quickly ________ the little rain that fell last night.
D
暂无解析
We must ______ that the experiment is controlled as rigidly as possible.
SinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.
Thewealthofacountryshouldbemeasured________thehealthandhappinessofitspeopleaswellasthematerialgoodsitcanproduce.