5.Everyone who he had seen at the party was anxious to recount their story of Tiki's escapade with the dancing hooker and the salad fork.

Ans.

5.Everyone whom he had seen at the party was anxious to recount his/her story of Tiki's escapade with the dancing hooker and the salad fork.

1) The relative clause "whom he had seen at the party" already has a subject ("he") so the relative pronoun must take the object form ("whom") (1 pt.)

2) "Everyon"e is the antecedent of "their"; however, "everyone" is considered singular indefinite. Therefore, the pronoun must mirror the singular, and it should be "his/her."

Total = 2 pts.