Water is composed _______ hydrogen and oxygen.
A、ofA
becomposedof：由…組成。句意：水是由氫與氧化合而成的。
Themeeting_____nextweekwillbeofgreatimportance.
Aftermonthsofvoyage,Columbusarrivedin______laterprovedtobeanewcontinent.
Wateriscomposed_______hydrogenandoxygen.
Theypreferto_______therestofthemorningwalkinginthegarden.
After months of voyage, Columbus arrived in ______ later proved to be a new continent.
