He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

He has a deep interest in paleozoology.

He worked all night to finish the job he had begged for.

When she said thank you, I replied you're welcome.

He had a doctor look at his oesophagus problem.

How do you solve this problem?

He is a world-famous judoka.

He is a person who always values humanity.

It takes time to introduce a new system.

His popularity plummeted due to the backlash of that policy.