CS giai thik 12. This is ______ the most difficult job I’ve ever had to do. A. by chance B. by far C. by heart D. by myself 13. _____ the young still have to learn is the value of our tradition. A. That B. This C. What D. It 14. Mother’s love for her children could never die _____ she’s alive. A. as deep as B. as if C. as for D. as lon

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