I think his Japanese has improved quite a bit, hasn't it?

I am busy with work during the daytime.

My keys are inside the house.

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

When you read the Book of Revelation, you will be surprised that prophecies about the future are written.

When you read the Apocalypse of John, the prophecies of the end times are written in detail.

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

His role is to fulfill his responsibilities as a leader.

I am reading the Old Testament.

It is important to understand the importance of health.