All of us _____ Hong Zhanhui, a university student, who takes good care of his sick father and little sister. [ ]

A. speak highly of

B. catch up with

C. look out for

D. are fed up with

6西格玛质量管理的分析方法是流程分析和数据分析两种分析方法的综合，通过收集的数据对每一个环节进行逐一诊断，直至找出问题环节。