I decided to take a sick leave.

He lent the textbook to the underclassman.

Astronomers are studying the movement of the celestial sphere.

I look forward to playing casual amateur baseball with my friends on weekends.

My niece is very smart.

They formed a new alliance.

It's difficult to solve this riddle.

He got lost in the city.

Can you hear that dog's cry?

Thunder is rumbling in the distance.