---Look, Sue is over there. --- That ____ be her. She is in Canada now.
In our class _____ of the students _____ girls.
—Which country has the_____population in the world?—China.
—David has made great progress recently.—_____, and _____.
This is the most beautiful park I have _____ visited.
—When did the Greens come to China?—They_____ China for seven years.