You should fit in with the others 你应该和别人友好相处
fit in with 适合, 适应, 与...一致(意指和睦相处)
You should live in concord with others 你应该和别人友好相处
live in concord with sb.
与某人和睦相处
You must know how to get on well with others.
You should learn to build good relationships with others.
you should get on well with others