Final answer:
The most appropriate verb for the blank is 'dice' (says).
Step-by-step explanation:
The verb that best fits the blank in the provided statement is dice. The sentence translates to: 'The teacher says that we need to study a lot for the exam.'
In this context, the verb 'dice' (says) is the most appropriate choice because it conveys the action of the teacher communicating the information to the students.
Using the verb 'limpia' (cleans), 'necesita' (needs), or 'habla' (speaks) would not convey the intended meaning of the sentence.
Learn more about Verbs in Spanish