Defining/Non-defining relative clauses

We spoke to two teenagers _____ live in English-speaking countries

This is the bag ______ I carry all my schoolbooks in.

A detective is a person __________ catches criminals.

That's the time of year ________ it's always warm and sunny.

A hospital is a place _________ people come to see a doctor.

She is the girl ________ mother is a teacher.

A camera is a machine ________ takes photos.

London, _____________, is an amazing city.

My grandparents, _________, visit us every weekend.

Billy is the boy ______ sister lives in Rome.

Room 21 is the classroom _______ we have our English lessons.

My bedroom, _________, is very small.