Do you know the _________ of the saying I just quoted?

The new discovery is of ________.

In many ways China’s rapid growth has been seen as a(n) ______ to improve the cooperation with other countries.

 ---Can you tell me why more and more people choose to shop in a supermarkets? ---Because it offers a great ______ of goods.

I arrive at nine o’clock, teach until twelve thirty and then have a meal; that is my morning       .