For this case what we should do is fill in the blank with the correct verb.
The verb to complete the expression in this case is given by:
(Hablar)
Then, we must choose a time to conjugate. Suppose that the conjugation time is simple present.
The conjugation will be done for the third person singular.
Completing the sentence in Spanish we have:
La clase habla de la tarea.
The translation of the sentence in English is:
The class talks about homework.
Answer:
"habla"
La clase habla de la tarea.