Extra activities:
http://www.focus.olsztyn.pl/en-exercises-pronouns-test-20.html#.WH3vpFPhCM8
https://www.ego4u.com/en/cram-up/vocabulary/some-any/exercises?03
http://www.agendaweb.org/exercises/grammar/anything-something
https://www.ego4u.com/en/cram-up/vocabulary/some-any/exercises?04
