options: f : since he is not humorous at all . the philosophy teacher is not so popular among his students . f : the classes given by philosophy teacher are quite boring and we do not like it at all . f : yes . we are all interested in the philosophy classes even if they are very boring . f : yes . we are all interested in the philosophy classes .
article: f : our philosophy teacher is very humorous . the examples he gives are very interesting . m : no wonder when i pass your room , i always hear your laughter .