He is conducting research on a new energy source.

He is researching about a new energy source.

All the people of this nation should be equal.

Democracy is a political system that respects the opinions of citizens.

He is very popular among netizens.

I bought 5 copies of the newspaper.

He belongs to the sales division of the company.

He belongs to the sales division.

This fossil is a part of a silicified tree.

He lost everything.