1. (2022·哈尔滨模拟) As middle school students, we should learn to get on well with our classmates. If something unhappy happened among classmates, we should______.

①keep silent and wait until it is forgotten

②find out the reason and care about each other's feelings

③never solve problems by fighting

④tell it to our teachers at once whatever it is

⑤keep our cool and control our feelings