He had to___ before they finished the course because they were not well disciplined.
Boris has brains. In fact,I doubt whether anyone in the class has ____IQ.
Yesterday Jane walked away from the discussion. Otherwise,she ____ something she would regret later.
An awful accident_____,however,occur the other day.
Greenland, _____ island in the world,covers over two million square kilometers.
_____, he often forgot to turn off the lights.