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Complete the eccentric billionaire's last will and testament by selecting the correct words for each gap.
"I hereby declare that _________________________ manages to survive a night in my mildly haunted mansion _________________________ to inherit my vast fortune, and _________________________ remains of my antique spoon collection shall go to my beloved cat, Mr. Whiskers."
The correct answers are whoever, is, and what.
whoever: In a nominal relative clause, the pronoun takes the case required by its role inside its own clause. Here, it is the subject of the verb "manages," so we need the subjective case "whoever." ("Anyone" is incorrect because it would require a relative pronoun, like "anyone who manages").
is: When a nominal relative clause ("whoever manages to survive...") acts as the subject of a sentence, it generally takes a singular verb.
what: This acts as a nominal relative pronoun meaning "the thing(s) that." Both "which" and "that" are standard relative pronouns and would incorrectly require a preceding noun (antecedent) to attach to.