2. We should unite the collective, care about friends, respect teachers and let others live with dignity. Be kind to other people's lives.
Love animals and plants. Most of them are good friends of human beings and can't be hurt. Be kind to the lives of other creatures.
4. Summary: From ourselves to others, to other creatures, and even to the environment of the whole earth, we can draw a conclusion that we should treat life well and build a harmonious society.
Some of them are general. You can write more yourself. )