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。
CharlesSmith,______wasmyformerteacher,retiredlastyear.
Thecentraltheatrehasaseating________ofmorethan3,000people.
Thetwogirlscompetedwitheachother______thehighestmark.
Hewouldhavegivenyoumorehelp,ifhe________sobusy.
Becauseofthebadweather,thesportsmeethadtobe________.
