______ has recently been done to improve the conditions of elementary schools, a great number of children are unable to go to school.
______ met, it won’t be easily forgotten.
-----They used to be good friends, but now they are like strangers. ----- How _____ this ______?
We have spent _____ money on English books.
People in America speak the same language ______ the British do.
Who has found out the answer _____ this question?