He is my classmate.

My mother was surprised when she saw my report card.

He publicly admitted that he is a bisexual.

The sinusoid is used to represent many phenomena in nature.

His standard of living has improved significantly.

His brother was diagnosed with schizophrenia a long time ago.

Sexual reproduction is one of the methods of reproduction in organisms.

I think he has a high aptitude for music.

His lust for conquest made him a powerful leader.

The artificial satellite is orbiting around the earth.