What did the teacher do with Oscar's cheese report answer?

The answer is He Grated it.

Grated has the meaning to scrub a certain material and transform it into smaller shapes. The word grated had a similar sounding with 'grade', which is the actions took by the teachers to give scores for the students.

What is the meaning of the word 'grated'?

The meaning of the word 'grated' is to scrub a certain material and transform it into smaller shapes.

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