When the alarm clock rang, I immediately jumped out of bed.

This antique clock is a keepsake from my grandfather.

He measures time accurately using an atomic clock.

He found an ancient fire clock.

There is a new radio clock in my room.

He looked at his pocket watch and checked the time.

My biological clock is completely messed up.

He is an expert in clockwork.

Looking up at the starry sky, I could clearly see Horologium.

It is necessary to finish the chess game within the time limit using a game clock.