Wateriscomposed_______hydrogenandoxygen.
A
be composed of：由 …组成。句意：水是由氢与氧化合而成的。
Itisdifficultto________theimplicationbetweenthelines.
Thebookfairhasreceivedapositive________fromreaders.
It_______methreeyearstodrawthebeautifulhorses.
Ittookmeamonthtogetrid_______thecough.
_______foryourlaziness，youcouldhavefinishedtheassignmentbynow.
