Wateriscomposed_______hydrogenandoxygen.
A
be composed of：由 …组成。句意：水是由氢与氧化合而成的。
Ittookmeamonthtogetrid_______thecough.
AtanyrateIdidnotsucceed_______myselfunderstoodbyyou.
Itisimportantto________yourskinfromtheharmfulstrongsunlight.
Hewouldhavegivenyoumorehelp,ifhe________sobusy.
Becauseofthebadweather,thesportsmeethadtobe________.