The words that best completes the sentence is
"Mr Bello is the teacher. I am his student"
The article "the" is used to show a definite word, that is to say that Mr Bello is definitely the teacher.
The possessive pronoun "his" is used to show ownership.
What this means is that it shows without any iota of doubt that the narrator is the student of Mr Bello
Therefore, the best words that complete the sentence are "the" and "his"
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