He attacked the enemy's position using a grenade launcher.

I am planning to go to Inner Mongolia, an autonomous region of China, next week.

I have been to Outer Mongolia.

I have been to Chicago.

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

He was pretending not to witness her wrongdoing.

He played beautiful music using a pellet drum.

He has fundamental knowledge of mathematics.

His recovery was truly miraculous.

We are part of the solar system.