The study of galaxy clusters is essential for understanding the universe.

He belonged to a medieval order of chivalry.

My younger sister belongs to the school choir.

The cheer group at my school is very lively.

The delegation left to attend the international conference.

Tanji is my best friend.

He decided to join the vigilante group.

We visited Kyoto as a tour group.

There is a wonderful volunteer fire department in my town.

We went to see a circus over the weekend.