Do you know why the sun looks much bigger on the horizon?—- Well, well, ______. I’ ve never read about that.
In the street I met the professor______ gave us a talk last week.
What do you think of the four classics (名著)of China?-I hear that they are wonderful, but I’ve read _______ of them.
Don’t talk here. Grandparents ____.
Do you know what in the room at the moment?