Final answer:
The appropriate verb to fill in the blank is 'tocan'.
Step-by-step explanation:
The appropriate verb to fill in the blank in this sentence is tocan.
'Uds.' is the abbreviation for 'ustedes' which is the formal second-person plural pronoun in Spanish. When conjugated with the verb 'tocar' (to play), it becomes 'toca' in the third person plural form. Therefore, the correct sentence is 'Uds. tocan el piano todos los días.'
Example:
Ellos tocan la guitarra en la banda de la escuela.
Learn more about Spanish verbs