Health officials have tried to raise _______ about the H1N1 flu among all people.

He knows so much about Russia that he's universally acknowledged as a(n) _____ on Russian affairs.

The people from the south enjoy the________in the north during the winter because they have never seen snow before.

Usually a child’s behavior is a(n) ________ of his family environment.

The most important _____ of his speech was that we should all work whole-heartedly for the people.