A railroad system mostly underground is called a subway system.

The inability to speak in public for many people is very common.

The ability to help others is to teach something worthwhile.

A group of objects in a set series or time or date is called a collection.

Under the surface of anything is called underneath.

Teaching is not set in stone.

Buying products from a  factory and then reselling in a store is known as buying at a wholesale rate.

People like conversation no matter the environment.

A whirlpool is created when a large body of water in a lake,river or ocean swirls rapidly in a circular pattern.

Nature will always inspire you.