--- Who is over there in the dark?---_____. What you saw is just a chair.
—Sonia, do you think you are different from Linda? —Yes. I'm ______ at drawing than her.
Lin Shuhao is ______famous ______ all the basketball fans in China know him.
—Your paintings are so great, David! When did you learn ______? —Three years ago.
—Cathy, could you come to our art club tomorrow? —______.
As volunteers, they should do ______to help the children in trouble.