用方框中所给词或短语的适当形式填空。
on one's own, certain, housework, warn, might
Believe it or not, no bread eaten by us is so sweet as________earned by our own labour.
董仲舒说：“古之造文者，三画而连其中，谓之王。三画者，天、地与人也；而连其中者，通其道也……非王者，孰能当是？”（ ）
据材料推断，董仲舒意在
