He is a hardworking student he does not _____

The correct phrase to complete the sentence is give up. The sentence means that the student continues working hard and does not surrender or quit. Give up is a phrasal verb that expresses the idea of stopping effort or abandoning a task. Stop and refuse do not convey the same meaning in this context. Phrasal verbs are a common part of English language and mastering them is essential for fluency. They often have meanings that cannot be guessed from the words alone. Therefore give up is the best choice and fits the meaning of the given sentence correctly.