—Your paintings are so great, David! When did you learn ______?—Three years ago.
It’s good__________your health_________.
__________he is ill, __________he goes to school.
The story is about Lei Feng.It's very ______.
—Which is______,the sun,the moon or the earth? —Of course,the moon is.
I bought ______ for my son,but ______ for myself.