Sofarscientistshaveonlyacquired________understandingofthephysicalprocessesthatcauseearthquakes.

On average about ￡5000 a year is spent on each private school pupil,_______ the amount spent on state school pupils.

Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.

名词解释：copyright

—You were brave enough to raise objections at the meeting.

— Well, now I regret ________ that.