Which of the following words can NOT be added the prefix "un_______" to give it the opposite meaning?( )
A.happyB.healthyC.usualD.polite
There is no dictionary _______you can find everything.
Three years has passed, but we can’t forget the people _________ helped me a lot in the past.
He is one of the cleverest students ________ hard work was paid in the end.
Great Britain is one of the countries ____ people drive on the left.
That’s the girl _____ spirit is spread the whole area.