He has a habit of always boasting.

This lime sulphur is very effective in preventing pests and diseases in fruit trees.

The era of the Three Sovereigns and Five Emperors is an important period in Chinese history.

My friend came from Congo-Brazzaville.

I have been to Congo-Kinshasa.

Burgundy wine is famous worldwide.

I do laundry using synthetic detergent.

I learned Pythagoras' theorem at school.

He participated in the Olympics as a pentathlon athlete.

Pentathlon is a competition that tests both physical strength and technique.