His intonation indicated that he was angry.

How long is the perimeter of this rectangle?

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 was respected as the tribal chief of the tribe.