Wateriscomposed_______hydrogenandoxygen.
A
be composed of：由 …组成。句意：水是由氢与氧化合而成的。
支持代孕的理由有
Hisintelligencewill________himtogetascholarshiptocollege.
Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
Pleaseremindme_______herthisnote.
Theboycomplained_______apaininhisstomach.