His intonation indicated that he was angry.

He was chosen as the leader of our class.

He went to see a movie with his Korean friend.

I looked in the telephone directory and searched for his number.

The penguin lives in Antarctica.

I saw a flying bird in the park.

He explained in detail about the structure of the sphenoid bone.

This butterfly valve is used to control the flow of fluid.

He is able to both talk and do, and can handle any job.

He became a prisoner of conscience because of his political beliefs.