this is/ these are

http://www.saberingles.com.ar/curso/lesson04/08.html

that, those

http://www.members.iinet.net.au/~adelegc/grammar/this_that/that_those.html

this, these, that, those

http://eolf.univ-fcomte.fr/uploads/ressources/grammar/01_adjectives/01a_this_that_these_those/01.htm

this, these

http://www.bnv-bamberg.de/home/ulrich.koch/flg/englischinteraktiv/this-these2.htm

this, these, that, those

http://eolf.univ-fcomte.fr/uploads/ressources/grammar/01_adjectives/01a_this_that_these_those/02.htm

numbers

http://www.oup.com/elt/global/products/headway/beginner/b_vocabulary/vocabularyunit01/hwy_begin_unit01_4/

have got

http://www.ego4u.com/en/cram-up/vocabulary/description/exercises?03

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a/an

http://www.englishexercises.org/makeagame/viewgame.asp?id=1971

a/an

http://www.ego4u.com/en/cram-up/grammar/nouns/exercises