According to scientists, our mental abilities begin to _______ from the age of 27 after reaching the highest level at 22.
A British man who ____ to play practical jokes ____ his own humorous art work in four major New York museums over the last two weeks.
____ nearly all behavior is learned behavior is a basic assumption of social scientists.
I know the man by ____ but I have never spoken to him.
My command of English is not ____ yours.
The generous donation from China to the sufferers in the killing Indian Ocean Quake-tsunami has ____ the Chinese people’s unselfishness and internationalism.