Here are a couple practice activities… for imperfect vs preterit on quia (you can search on quia for imperfect vs preterit)
http://www.quia.com/pop/436360.html?AP_rand=124086393
http://www.quia.com/pop/436360.html?AP_rand=1494471620
battleship http://www.quia.com/ba/31465.html
practice 4-2 vocab for Friday’s quiz
http://www.quia.com/cz/455094.html