Relative pronouns

Which pronoun goes with the sentence: “He is a boy, ______ studies at our school.”

Which pronoun fits the sentence: "This is the city ______ I was born in."

Який займенник підходить до речення: «Це вчитель, ______ навчається нас англійської».

Which pronoun goes with the sentence: “This is a book, ______ I like.”