- Mr Li is said to be very patient with his students. - Yes. But its really a hard for h

问题补充：

- Mr Li is said to be very patient with his students.

- Yes. But its really a hard for him to control a class of young children.

A. work

B. skill

C. task

D. experience

答案：

A. work

B. skill

(答案→)C. task

D. experience

解析：句意：据说李老师对学生很有耐心。是的，但管理好一个班的小孩子对他来说是个艰巨的任务。A工作；B技能；C任务；D经历；work 做名词“工作”时是不可数名词，再结合题意选C。