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

He is said to be a member of the Princelings in China.

The crown prince is a symbol of the people's hope and respect.

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.

I want to travel to many countries.

Let's try to predict tomorrow's weather using the future tense.

He is passionate about his research in futurology.

I am amazed at the advancement of near-future technology.