Final answer:
The correct form of the verb 'beber' to complete the sentence is 'beben'.
Step-by-step explanation:
The correct form of the verb beber to complete the sentence '¿Uds. _________ café?' is beben.
'Uds.' is the abbreviation for 'ustedes', which is the second person plural pronoun in Spanish, meaning 'you all'. The verb 'beber' means 'to drink', and its conjugation for 'ustedes' is 'beben'. Therefore, the correct form of the verb is beben.
Learn more about Spanish verbs