1. (2021·南岗模拟) As middle school students, we should learn to get on well with our classmates. If something unhappy happened between classmates, we should _____________.

①keep silent and wait until it is forgotten

②to be a good listener to think about each other 's feelings and find out the cause

③never solve problems by fighting

④tell it to our teachers at once whatever it is

⑤keep our cool and control our feelings