Research ________out at Livepool University supports this idea and suggests that if we don’t use the sense of direction, we’ll lose it.
The half smile on the little hero’s face seemed to suggest that he was happy __ his life for his country.
He forgot to turn off the light.So he went to bed with the light ___on.\
Asia is the largest continent, ___ one third of the earth’s land area.
After many months of hard work, they manager __ off all the debts.
Mike is taller than __ students in the class.