Look! ___________ are under the sofa.
—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.
Which is the picture of the best tennis player in China?
—Why do you want to stay at home?—Because I ______ good when I am with my family.