---Do you often see Mr. Smith ______ on the playground ?---No! But he is often seen ______ Chinese Kungfu in the park.
When the teacher walked into the classroom, the students ____ at once.
He speaks English ____ than any other student in his class.
Liu Xiang is regarded ____ one of the best runners in the world.
____ are you going to be ____ you grow up?
Hi, Jane! I have ____ to tell you.