One of our rules is that every student wear the school uniform while at school.
Alice was lucky enough and she was the only one of the girls in her school who __________ to France as an exchange student.
Mary is the only one of the teachers who __________ a little Chinese because she is one of my friends who __________ been to China.
Joan is one of the best writers who __________ published a lot of books.
It is the first time that I __________ the video of Gangnam Style.
I have heard a lot of good things about you __________ I came back from abroad.