Final answer:
The student is asked to fill in the blank with the appropriate vocabulary in Spanish. The correct answer is "Hay que estudiar mucho".
Step-by-step explanation:
The subject of this question is Spanish. The student is given a sentence in English, "It is necessary to study a lot", and is asked to fill in the blank with the appropriate vocabulary in Spanish. The sentence that fills the blank is "Hay que estudiar mucho". Here, "hay que" means "it is necessary to" and "estudiar mucho" means "study a lot". So, the correct answer to fill in the blank with the appropriate vocabulary in Spanish is "Hay que estudiar mucho".
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