---Are Mr. and Mrs. Wang living alone in the house? ---Yes, they have three sons, but ______ of them live in their own houses.
______ can help us learn ______ about the world.
There is a teacher’s desk _______ of the classroom. Mr. Liu is standing _______ of it.
_______ takes her about ten minutes ________ to school by bike every day.
The buildings _______ your school _______ modern.
______ you a happy New Year, boys and girls! I ______ you can have fun.