Question

complete the sentence with the past progressive form of the verb.
hassan
sit
quietly in his living room, studying for a biochemistry exam, when loud music
started blaring from a neighboring apartment.

Explanation:

El pasado progresivo se forma con el verbo "to be" en pasado (en este caso "was") y el gerundio del verbo principal (en este caso "sitting"). La estructura es: [subject] + was/were + [gerundio]. En este caso, el sujeto es "Hassan", por lo que se usa "was".

Answer:

was sitting