Identifying-/Non-identifying Relative Clauses

John is a boy .... studies hard every day.

This is a bicycle .... I used to ride to school on.

I remember the time .... I fell and broke my arm.

The reason .... he is happy is that he has just passed his exams.

Where is the bread .... I bought this morning?

That is the woman .... best friend is a film star.

Paul is holding the prize .... he won in the competition.

The chair .... she is sitting on is an antique.

The woman .... lives in that house is very rich.

The book .... I borrowed from the library is very interesting.