Detailed Instructions: In this task, you will be given a passage, a question and a list of single-word events identified from the passage. The goal is to point out all events from the given event list that can answer the question. If a question is unanswerable or none of the events answer the question, output should be empty.
Q: Passage: Government officials had threatened to revoke the boy's parole if his great-uncle, Lazaro Gonzalez, did not sign a document agreeing to hand Elian over to federal officials once the family's appeal in the 11th U.S. Circuit Court of Appeals was decided. Question: What should happen before the boy's parole? Events: ['threatened', 'revoke', 'parole', 'sign', 'agreeing', 'hand', 'appeal', 'decided']
A:
sign