The formation of a mountain requires millions of years.

He formed a new team.

This ancient artifact is very valuable.

It is very interesting to learn about ancient history.

We should take responsibility as part of society.

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

This book is the first volume of a trilogy.

He bought a new jacket.

My room is on top of the building.

We will make a decision after listening to his opinion.