-Do you know the boy is sitting next to Peter? -Yes,He is Peter’s friend,They are celebrating his birthday.
—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.