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

This ship is equipped with a new propeller.

Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

It is important to understand the importance of health.

We are planning to go to the national park this weekend.

I plan to go to the national museum this weekend.

My father works at a public profit corporation.

He is a very excellent technician.

My father serves as a director of a corporation.