In societies where social roles are determined, boys usually copy the behavior of their fathers, and girls usually also copy _____ of their mothers.
At the sight of the policeman, ____ from behind the door.
Only when ___ possible to settle the problem.
___ different life today is from ___ was 50 years ago!
The Japanese guests suggested ____ their country.
What idea can a man who is blind from birth have ____ color?