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: As for the serious drought problem complained by villagers, Wen called on governments at various levels to build an irrigation system and improve water conservancy facilities in a bid to upgrade drought-fighting ability. Guangxi, with a population of over 46 million, is home to more than 15 million Zhuang minority people.

called