He cast the spell.

He found it difficult to spell that word.

His spelling is perfect.

My friend is working in Columbus.

The preacher started preaching in the church.

He hydrogenated fatty acids in a chemical experiment.

This compound is stabilized by hydrogenation.

Thales was an ancient Greek philosopher.

The Shonagon was an important position in the court during the Heian period.

Ramesses was a great pharaoh of ancient Egypt.