In the piano contest, my brother didn't play well and I did_
—In the old days, most teenagers had to work for the landlord (地主) in the field to help _____ their families, because their families couldn’t _____ education for them.—What a pity!
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.