Given the task definition and input, reply with output. 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.

Passage: China and the Philippine are among six countries which claim all or part of the Spratlys, which are believed to sit atop oil deposits and command strategic shipping lanes. Acedera said a military reconaissance plane monitored the three Chinese frigates "in the immediate vicinity" of Kota and Panata islands, which are among eight islands occupied by Filipino troops in the South China Sea chain. Question: What did a plane do before Acedera spoke? Events: ['among', 'claim', 'believed', 'sit', 'command', 'said', 'monitored', 'among', 'occupied']
monitored