We are putting a lot of effort into protecting intellectual property.

He was feeling guilt.

Zaire is the name of a country in Africa that once existed.

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.

He can play the piano freely.

He is living freely.

His hidden talent became apparent.

His talent is still hidden.