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A great teacher had a lot (加入of) pupils. One day, one of them was caught stealing by his classmates and they reported him to (a改成the) teacher. But the teacher took no action against the boy, (that改成which) angered the other students who (去掉was) threatened to leave if the boy was allowed to stay. The teacher said to (him改成them), "You are good boys who know what is right and what is wrong. If you leave you will have no trouble in (join改成joining) some other schools. But what about your brother who does not even know the difference between right (or改成and) wrong? I cannot ask him to go even if it means losing (both改成all) of you." The boy who (has改成had) stolen burst into tears and never stole again.