_____ medicine works in a human body is a question ____ not everyone can understand fully.
Helen was much kinder to her youngest son than to the others, _____,of course,made the others envy him.
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.