There is nothing in his room.

He was laughing happily.

Everyone was paying their respects in silence.

He is suffering from a serious disease.

He looked out the window.

I sincerely apologize.

Chromium has the property of changing color depending on its oxidation state.

He was blocking the road.

Chromium is an important element in the production of steel.

Neodymium is one of the most powerful permanent magnets on Earth.