Anonymous A) I went to the dentist's. He is a friend of mine. I met him at university.
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AnonymousA) I went to the dentist's. He is a friend of mine. I met him at university. ---- THE DENTIST WHO I MET AT UNIVERSITY IS A FRIEND OF MINE.OK, but "who" can be omitted.
AnonymousB) A song won the competition. It was written by a school boy. He was thirteen years old. ---- THE SONG WAS WRITTEN BY A SCHOOL BOY WHO WAS THIRTEEN YE