He is the best student of all.
He is the best student in his school.
It's the smallest country of the seven.
It's the smallest country in the world.
This is the most important document of the
⇔ This document is the most important of the three.
That's the most famous festival in the
⇔ That festival is the most famous in the nation.
That was the most serious problem in my
⇔ That problem was the most serious in my married life.
He jumped the highest of the jumpers.
She studied the most enthusiastically in