He is my favorite teacher.

He is my music teacher.

Mr. Shi is my neighbor.

After a cold front passes, the temperature drops sharply.

The herald came to deliver a message from the king.

In this company, it is a convention for new employees to greet their seniors.

This area is rich in bedded cupriferous iron sulphide deposits.

He is researching on the pathogenesis and treatment of early-onset diabetes.

My friend came from South Africa.

I have a deep interest in South Asian culture.