He specializes in medical research.

He suffered a big loss due to the breach of contract.

He broke the contract.

He belonged to an ancient clan.

An arc of electricity passed through the air.

I like listening to Beethoven's Ninth.

What is tonight's program?

He understood that his actions would sow evil and reap evil.

Understanding the importance of punctuation is very important when writing sentences.

His collection is very impressive.