In this pair drill students take turns asking and answering questions in the preterite with verbs that end in -gar/-gar/-zar. I use this activity with the textbook Avancemos 3 Unidad 1 Lección.
To use this activity, print enough copies for 1/2 of your largest class. Cut each page in half. Put students in pairs giving each person in the pair half of the sheet. When students get to the bottom of the sheet, they switch papers and do the drill again. In my classroom, students must repeat the drill until they are instructed to stop.