I go jogging every morning before noon.

He is in the middle of studying for the exam.

Cultural exchange between China and Korea is very important.

Mr. Nakai is my best friend.

That building is very tall, dominating the city's skyline.

This temple is an ancient ruin.

Many students are gathering in the lecture hall.

The Ordovician, an era name used in paleontology, is now called the Ordovician.

The Silurian period is one of the geological eras.

The Devonian period was a very important time in the history of the Earth.