Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: A key to the problem has been the failure of the European constitution, endorsed by EU leaders but which was rejected by French and Dutch voters last year, sparking the bloc's worst-ever crisis. The constitution was meant to streamline the EU's institutions as the bloc grows, but while there have been tentative moves to discuss alternatives, no real solution to the blueprint for Europe's future is expected before 2009.

problem