—President Obama has never been to Beijing, ______ he? — He visited the Great Wall on the afternoon of November 18th,2011.
-Who drew the picture?-Mary did. She can draw very well, _____she is only a ______girl.
The moon is_____ us in space.
There _____food and more people____100 years.
Tom wants to be_______ engineer when he _________up.
“Everybody is playing basketball outside. Can I join them, Dad? ” “_____________, you must finish your homework first. ”