My class starts at eleven o'clock.

My younger sister is twenty-one years old.

My room is on the upper level.

They are treating all students as one.

He tends to regard all people as the same.

Her dress was a single point of red, standing out in the party.

Solving a linear equation is difficult.

Mr. April First is my best friend.

He was reading a book in his room all day.

The first storm of spring blew fiercely, and the cherry blossom petals fluttered up.