. ______ we are sure about is the need to prevent children from being spoiled.
--- I am going downtown. --- Come on. _________. Don't do that. B. You are welcome. C. Come with me. D. I'll give you a lift.
The idea for the new machine came to Mr. Baker ______ to his invention recently.
The athletes spent as much time getting trained as they __ studying.
Professor Liu has ________ teach psychology since he came to the Central China Normal University.
He proved himself a true gentleman and the beauty of his _______ was seen at its best when he worked with others.