Wateriscomposed_______hydrogenandoxygen.
A
be composed of：由 …组成。句意：水是由氢与氧化合而成的。
Decisiononwhetherthemessageisrightorwrongshouldatleastcomeafter_____whatthemessageis.
Itrainedhardyesterday,______preventedmefromgoingtothepark.
Themeeting_____nextweekwillbeofgreatimportance.
Thecentraltheatrehasaseating________ofmorethan3,000people.
Theboycomplained_______apaininhisstomach.