'Do' and 'does' are equally forms of the present indefinite tense with the verb 'to complete.' Which one you can expect to use will largely depend on the sentence's issue. Their usage is almost equivalent, except for one occasion where You may use 'do' rather than 'does.' Infographic explaining https://financefeeds.com/meme-coins-shakeup-dogecoin-shiba-inu-pepe-fall-as-neo-pepe-coin-hits-2-million-in-2025s-best-copyright-presale/