Answer: desire and ignorance lie at the root of suffering. By desire, Buddhists refer to craving pleasure, material goods, and immortality, all of which are wants that can never be satisfied. As a result, desiring then can only bring suffering.
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True, A pledge is a solemn "promise" to another individual to "do something". Thus, undertaking the task "promised"
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MERCOSUR is an abbreviation of "Mercado Comun del Sur": common market of the South America: most of the eastern South American coutries are members of this common market.
It's a trade block of countries in South America which promotes free trade and free movement of people.