21.The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.
She is a beautiful girl and she likes dancing very much. _____.
No sooner _____ the boy fall into the pond than he ____ to his feet and went to the rescue.
On no account _______ out of the reading-room.
_________ when we Chinese people must depend on others.
_________, I could have done something.