You could maybe at a point where Bella and Alejandro meet before she knows it’s him. It’ll make it more of a surprise if she already knows who it is, and was unsuspecting when she first met him.
Option 4 is the one which uses a parallel structure:
<span> 4) I also plan to organize more school dances and give my fellow students more opportunities to interact socially.
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A parallel structure is a sentence that uses the same tense or form of a verb throughout. So, number 4 is the only sentence that does that - the other sentences mix a lot of forms and tenses, which shouldn't be done.
