In many parts of China, ________ the idea ______ boys are more important than girls.

No sooner _____ back to the kitchen than the doorbell rang.

It'll be ten years ___ we have the chance of seeing each other.

There is no _________ that the Chinese people will present to the world a successful, splendid and unforgettable exposition（博览会）.

Class regulations state _____ is the last to leave the classroom _____ off all the lights.