His talent is still hidden.

His hidden talent became apparent.

These teaching materials are very useful for learning English.

The police suspect him of possessing stimulants.

Antibiotics don't work for colds, so rest is the best.

This drink contains additives.

When making bread, you need a leavening agent.

It is important to use mouthwash every day after brushing your teeth.

He couldn't answer the phone because of his absence.

This building is made of high-quality building stone.