— Somebody has left the lab door open.—Don't look at me.
There are ten______teachers and two hundred______students in the school.
Such a magazine has______except when you have time to kill.
We must take measures to protect endangered wildlife ______it is too late.
People living in the area where there is a lack of electricity often keep a supply of candles_______power failure.
_______ all his followers dead,the captain was taken by his enemy.