There is an opening ceremony at school tomorrow.

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.'

The shipworm is known for eating wood.

We crossed the sea by catamaran.

He engaged in an extravehicular activity from the spaceship.

He is undergoing training for extravehicular activity.

He loves watching American football games.

I am thinking of trying an electric smoking system.