The ______on his face told me that he was angry.

 All the         indicate that he has been deeply involved in the crime.

On Saturdays, students are very proud to be         on the street to guide passers-by to obey traffic rules.

In English colleges, classes are often arranged in freer and opener______and many jobs are designed for students.

Hardly a month goes by without ______ of another survey revealing new depths of scientific illiteracy among US citizens.