Non-defining relative clauses

This is a quiz about non-defining clauses I got from bbc.co.uk

Before you take it, keep in mind that:




1)Non-defining clauses are common in written English;


2)We never use THAT in non-defining clauses;


3)We have to use commas before non-defining clauses;


4)And, finally, it's not usual to omit the relative pronoun in non-defining clauses.

Let's get to work now! =)



http://downloads.bbc.co.uk/worldservice/learningenglish/quiznet/pdfs/qnet_304_clauses.pdf