Being kind to others should be everyone’sof life. our world will be more peaceful and beau

问题补充：

Being kind to others should be everyone’sof life.,our world will be more peaceful and beautiful.

A. aim;If so

B. standard;If that

C. belief;Even so

D. principle;If so

答案：

A. aim;If so

B. standard;If that

C. belief;Even so

(答案→)D. principle;If so

解析：principle of life 生命的原则；if so 如果那样的话。