In the first geological period, humans lived in caves.

The old kỉ is so beautiful.

The muntjac is running in the forest.

Kỉ is one of the twelve zodiac signs in traditional Chinese culture.

She is my bosom friend.

He always confides in me about everything.

She often acts selfishly without caring about others.

He is very selfish, always thinking only for himself.

I bought the school yearbook.

In the past decade, technology has developed rapidly.