He died from overwork.

Yoroshiku, please do your best to pass the exam tomorrow.

He decided to apply euthanasia to his sick dog.

The deathwatch beetle is known for eating wood.

I am very interested in sociolinguistics.

He is studying the history of National Socialism.

He deeply believed in the principles of state socialism.

He deeply believes in the principles of state socialism.

He was opposed to the principles of National Socialism.

Democratic socialism is a political theory that aims for a fair society.