Professor DeMarco is an excellent math teacher. ___a. He keeps extra office hours for students who are having trouble understanding the homework or the material presented in class. He questions students individually in class to make sure that everyone understands what is being discussed. If not, he explains the subject again in a different way to make it clearer. ___b. He cares about students, makes his classes interesting, and has taught me a great deal. I think these must be the reasons he is well liked and considered such a good teacher.