The cause of his lateness was a train delay.

This shape is called a gyrobifastigium.

He apologized to me sincerely.

They became in a relationship of mutual love.

Scientists are advancing research on nuclear fusion.

His name is a proper noun, known all over the world.

Because of his indecisive nature, he always takes a long time to choose a menu at a restaurant.

This beautiful zoisite necklace is my favorite.

A cellar spider is making a web in the corner of the room.

In this experiment, we will observe the reaction of organic compounds.