What is this mixture made of?

This structure was built centuries ago.

This is the souvenir I brought back from my trip.

My favorite mode of transportation is the train.

His art style is unique, it's neither fish nor fowl.

We should always remember the power of Kannon in difficult times.

Old Church Slavonic is the first language written by the Slavs.

Old Church Slavonic is the oldest recorded language of the Slavic group.

The study of organic compounds is an important field in chemistry.

Sandwich compounds are being studied in a branch of chemistry.