There is a closing ceremony at school tomorrow.

Well then, I'm off.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

He loves watching American football games.

I am thinking of trying an electric smoking system.

This bacteria multiplies exponentially.

This building is influenced by the ancient Greek Doric style.

Alicyclic compounds play an important role in organic chemistry.

He was interested in the ancient boustrophedon style of writing.

A tautology refers to a logical formula that is always true, no matter what values are substituted.