He picked up a stone and threw it.

Mr. Takagawa is my best friend.

Mr. Takakawa is my best friend.

I think it's an exaggeration to take a day off merely for a cold.

She bought new clothes.

My hometown used to be called 'Koromo'.

When I was a student, I used to study in the library every day.

He picked up a pebble and threw it.

Koromohen is the name of a specific Japanese kanji radical.

He learned the basics of Japanese.