Was or were - doplň správný tvar slovesa být v minulém čase
http://www.eflnet.com/grammar/tobepast.php
http://www.adelescorner.org/grammar/past_tense/was_were.html
http://www.adelescorner.org/grammar/past_tense/was_quests.html
http://www.englisch-hilfen.de/en/exercises/tenses/was_were.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=5133
http://www.englishexercises.org/makeagame/viewgame.asp?id=562#a
Good luck.
LS