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.

Input: Consider Input: Passage: South Korean prosecutors Friday summoned two senior opposition politicians for questioning over a massive graft scandal enveloping the Hanbo business group, prompting charges of a political conspiracy. The Prosecutor General's Office called in Kim Sang-Hyon of the main opposition National Congress for New Politics and Kim Yong-Hwan of the second opposition United Liberal Democratic Party. Question: What happened before the questioning? Events: ['summoned', 'questioning', 'scandal', 'enveloping', 'prompting', 'charges', 'conspiracy', 'called']

Output: summoned

Input: Consider Input: Passage: "The search for life is over," said Daniel Fernandez, of the Spanish search and rescue team BUSF, after a sweep of the area around the village of Maipon, near the volcano, using dogs. "There are no more survivors here." Question: What event has begun but has not finished? Events: ['search', 'said', 'search', 'rescue', 'sweep', 'using', 'are']

Output:

Input: Consider Input: Passage: After the water pollution incident occurred, China has repeatedly informed its neighbor of the details of the pollution incident, including various lab test results such as the pollutant's species and density and the location of polluted stretches. The two sides have agreed to open up a hotline between environmental departments for still better contacts and communication over the water pollution problem, and China informs Russia of the latest developments daily, the Chinese forign minister said. Question: What happened before the water pollution incident occurred? Events: ['occurred', 'has', 'informed', 'incident', 'incident', 'have', 'agreed', 'open', 'problem', 'informs', 'said']
Output: