Practice saying the words before students see the cards so pronunciation will be easier and quicker. Say one word and motion for the students to repeat it back to you. Say all the words several times, but make sure to say “Adagio” and “Vivace” extra times as they're not as easy to pronunciate. This could be done in the several sessions before playing with the cards or as the first step when playing the cards - depends on the students' ages and experience.