Indirect Object Pronoun

http://www.123teachme.com/learn_spanish/exercises_indirect_object_pronouns_1

http://www.123teachme.com/learn_spanish/exercises_indirect_object_pronouns_3

http://legacy.lclark.edu/~benenati/pronombrespersonales/indirecto2.html

http://www.amautaspanish.com/amautaspanish/test/testindex.asp?GrupPreg=23&Page=1