Grammar 9b

Here are the links:

http://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?02

http://www.ego4u.com/en/read-on/countries/uk/tour/stonehenge#exercises

http://esl.fis.edu/grammar/multi/relative1.htm

http://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns.htm