The factory which I visited yesterday was not the one I once worked.
I’m very proud of that Beijing is one of __________ cities in the world.
—Who helped Mark with his English?—_________, he taught himself.
Qingdao is a good place for summer vacation. My father ___________ there several times.
Remember to wash your hands __________ you have meals.
Could you please give me some ___________? I’m hungry.