He is spending a lot of time on experimental research.

He is conducting research on a new energy source.

He is researching about a new energy source.

This lake is very deep.

His eyes were filled with deep sorrow.

He found the target and shot the arrow.

Personally, I think this movie is the best.

He strongly believes in the value of humanism.

He is majoring in humanities at university.

He has a deep interest in humanities.