Номер 127 срочно там не понять (для меня)

A) what teachers do: ask clever questions, read detective stories during the lesson,
teach different subjects, explain dull grammar rules, work hard, have holidays many times a year, give instructions, be very polite, give bad marks.
b) what students do: give nicknames to their friends, answer silly questions, draw funny pictures on the blackboard, listen to music during the lesson, enjoy learning English, learn poems by heart, miss the lessons, wear jeans, play jokes, do homework every day, copy long sentences, get good marks.