He is my close friend.

My grandfather used to raise domestic silkworms and make silk.

Peroxidation is one of the chemical reactions, especially involved in the oxidation of lipids.

This apple is a countable noun.

I'm taking care of my health by having an extra meal every day.

He is good at adding numbers.

He is good at solving addition problems.

I go jogging every day.

That is my personal issue.

My name is Tanaka.