The best verb to complete the analogy "comprar: necesitar" would be "buscar". Here's the explanation: In the analogy "comprar: necesitar", the relationship between the words is that "comprar" (to buy) is an action that is done when someone "necesita" (needs) something. So, in this analogy, the verb that completes the second part should also be an action that is done when someone "perder" (loses) something. Out of the given options, "buscar" (to search) is the most suitable verb because when someone loses something, they usually have to search for it. For example, if you lose your keys, you would need to search for them. Similarly, if you lose your wallet, you would need to search for it. Therefore, the correct verb to complete the analogy is buscar