He was sitting as if glued to the TV.

My duty is to make this project successful.

He played the leading role in the movie.

He played the leading role in the movie.

He played an important role in that war.

He was working as an ancient official.

Astrocytes are one of the important support cells in the brain.

Oligodendrocytes play a role in supporting the nerve cells of the central nervous system.

This cell is dividing very actively.

He received the letter challenging him to a duel and began preparing for the duel.