On____cold morning in___October of 2010,we all saw the first heavy snow.

 Mr. Joe, ________ professor at the University of Fribourg, is famous for his academic achievements in ________ World History.

(2013·吉林长春三校高三调研)I started as ________ office clerk, and turned ________ department manager three years later.

In communication, a smile is usually __________ strong sign of a friendly and _______ open attitude.

While other scientists are keeping____eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in ____humans.