His actions change depending on the circumstances.

This is my first attempt.

His first choice of school is the University of Tokyo.

I will hold my birthday party on the fourth day of the month.

The process of terraforming is part of transforming other planets into a habitable environment for humans.

Earth science is an important field of study for unraveling the mysteries of nature.

I am an Earthling.

We are searching for extraterrestrial life.

If you're hungry, try eating some belly.

My room is the quietest in the house.