In this experiment, you can observe a chemical reaction.

His first choice of school is the University of Tokyo.

Watching a movie alone is enjoyable.

I went to see a movie by myself.

The first day of the month is the beginning of a new month.

I have been to France once.

He finished all his work all at once.

He has a competitive spirit that does not allow even one defeat.

The study of organic compounds is an important field in chemistry.

He is solely devoted to his work.