Hi Vincent, Peter was a 4 year old pupil. Science(1) was the subject he liked (the) most. One day, during a science lesson/class, he was attentively doing an experiment in a/the (2) lab.
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IvanhrPeter was a 4 year old pupil.
ecopsyIvanhrPeter was a 4 year old pupil.
It doesn't seem a right correction to me.
Regards.
You're right. I assumed that it was a reference to his age.