I use plain flour to make bread.

He proposed a new theory about quantum mechanics.

Thanks to his serendipity, we were able to find a new business opportunity.

Intermolecular forces are an important factor in determining the properties of a substance.

Katoriki is a rare name, isn't it?

He sealed the letter and posted it in the mailbox.

The school will be closed tomorrow because a typhoon is approaching.

The school was closed due to the snowstorm.

Let's respect Japanese customs.

He made various efforts to solve the problem.