Feudalism characterized the social system of medieval Europe.

Changes in the social system inevitably occur with time.

This system is necessary to maintain social fairness.

I am interested in the history of the Middle Ages.

Feudalism dominated medieval European society.

He is ruling the country.

He is ruling this country.

We plan to hold the meeting in Western European Time.

We should take responsibility as part of society.

I plan to travel to Europe next year.