About 60 percent of the students ________ from the south,the rest of them ________ from the north and foreign countries.
Was it through Mary, ______ was working at a high school, ______ you got to know Tom?
The father, ready to retire at an early age, hoped that his eldest son would ______ the family business.
My sister-in-law is the ______ of the information, so it cant be false.
--I believe that more effective measures have to be taken before we can breathe cleaner air.--______. Air pollution has become too serious a problem.
Only when our project has been approved of by the committee ______ to carry it out.