Identify the part of speech of the underlined word/phrase in the sentence and mark your response in the Answer Sheet accordingly.
He is one of the tallest boys in his class.

System performance was demonstrated ___ the Drop Zone from an altitude of 5000 m.

Ranjit has been elected as ___ leader of the group in the house.

Entry ___ the building was restricted due to the COVID-19 pandemic.

Education is a manifestation of ___ perfection already in man.

___ university is a place for thinking and learning.