Sennenji is my best friend.

This fossil is made of carbon.

Carbohydrates are important as a source of energy.

Carbonated beverages often go well with meals.

I am single and live alone.

My father had to move away from his family for work.

People from all over the country gathered to celebrate the emperor's birth.

He is an expert in enzymology and conducts many researches.

Hydrocarbon is a basic element of chemical reactions.

Heavy hydrogen is one of the isotopes of hydrogen.