He was so tired that he fell asleep immediately.

When I raised my voice in the library, my friend said, 'Shh.'

The 600-cell is one of the regular polytopes in four dimensions.

Please don't leave the door open.

He has three new cars in total.

I arranged to meet him at dusk.

My toxicology textbook is very difficult to understand.

Her smile was shining like the sun.

He is truly a chivalrous person.

He was respected by those around him for his chivalrous actions.