classes:  lecturer. Dear teacher, I am completely satisfied with the quality of your lessons and the knowledge you bring is really useful and rich.  curriculum. Dear teacher, I am completely satisfied with the quality of your lessons and the knowledge you bring is really useful and rich.  facility. Dear teacher, I am completely satisfied with the quality of your lessons and the knowledge you bring is really useful and rich.  general. Dear teacher, I am completely satisfied with the quality of your lessons and the knowledge you bring is really useful and rich.