He is an expert in brooding, always looking for the best ways to maintain the health of chickens.

He built a coop to brood chickens.

He is a specialist in that field.

We always pay attention to the maintenance of this machine.

He always keeps a smile on his face.

This is my best choice.

He achieved the best grades in the class.

We need moderate exercise to maintain our health.

Please tell me the way to solve this problem.

He searched all over the room and found his lost wallet.