---What’s wrong with my son, doctor?--- _______ serious. Just a slight cold.

The employment rate has continued to rise in big cities thanks to the efforts of the local govenments to increase            .

He thinks himself somebody, but we think him ______.

I want to be a volunteer some day. I feel _____ is my duty to help others.

Many people agree that there has never been a more splendid opening ceremony than _______ of the Guangzhou Asian Games in history.