'Do' And 'does' are the two forms from the current indefinite tense from the verb 'to complete.' Which a single you'll use will mainly rely on the sentence's topic. Their use is sort of identical, except for a person occasion where You need to use 'do' rather than 'does.' https://financefeeds.com/gbm-launches-auction-festival-with-the-sandbox-aavegotchi-unstoppable-domains-and-more/