उत्तर : 4. "Peak"
व्याख्या :

Zenith: The time at which something is most powerful or successful.
Peak: At the highest level; maximum.
Cherish: Protect and care for (someone) lovingly.
Pious: (of a hope) Sincere but unlikely to be fulfilleD.
Cheer: Shout for joy or in praise or encouragement.