Answer:
[tex]\huge \text{\tt{Its mission has been achieved.}}[/tex]
The noun "School" is replaced by the possessive pronoun "its." It indicates that the mission is school's, not others.
[tex]\tt{NOTE:}[/tex] Do not mistake "its" and "it's." The two are not the same. "Its" is a possessive pronoun while "it's" is a shortcut for it is. Possessive pronouns are not written with apostrophes (').
[tex]\pink{\overbrace{\underbrace{\tt{Happy\ learning!}}}}[/tex]
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