He has fundamental knowledge of mathematics.

His recovery was truly miraculous.

The floor of the room is cold.

He is a person who always keeps a smile on his face.

He made a bet on the spur of the moment, without thinking about anything.

He experienced nantaimori for the first time.

Sumatra, an Indonesian large island, has a lot of nature and culture.

I conducted an interview in a question-and-answer format.

The prepositional case plays an important role in English grammar.

Let's participate in the election by using early voting.