What is in this box?

His ophthalmologist found an abnormality in the vitreous body.

He accidentally broke the glass.

This zoo is putting a lot of effort into the protection of endangered species.

He did his best to protect me from danger.

The quality of the wood in this house is very good.

The price of this house changes depending on the type of material.

What is this box used for?

He is quite a good cook.

I think his Japanese has improved quite a bit, hasn't it?