Вкаждом ряду выберите один лишний элемент. объясните ваш выбор на языке. a) pupil, student, teacher, businessman; b) error, bad luck, luck, failure; c) to notice, to glare, to watch, to look; d) to drink, to sip, to eat, to gulp.

a) businessman - doesn't go with studying
b) luck - a positive feature
c) to notice - a short action
d) to eat - doesn't go with liquids