Write or type a review question and answer on each 3 x 5 card. (Q and A on the same side of the card) Put the cards face down in the box. The teacher picks a card, reads the first question and calls on a class member. If the student gets the right answer, he comes up and chooses a card, reads the question and calls on a class member. This continues until the cards are gone. The rule is "call on quiet hands only" No calling out. Sometimes I designate a particular turn when a student may call on boys only, girls only, or people who haven't had a turn only.