classes:  lecturer. enthusiastic teachers, effective method of instructing and correcting exercises to help students remember for a long time.  curriculum. enthusiastic teachers, effective method of instructing and correcting exercises to help students remember for a long time.  facility. enthusiastic teachers, effective method of instructing and correcting exercises to help students remember for a long time.  general. enthusiastic teachers, effective method of instructing and correcting exercises to help students remember for a long time.