You must take everything into when you want to do a difficult task.A. observationB. regar

问题补充：

You must take everything into when you want to do a difficult task.

A. observation

B. regard

C. count

D. consideration

答案：

A. observation

B. regard

C. count

(答案→)D. consideration

解析：考查固定短语。take sth. into consideration“考虑某事”。句意“当要完成一项艰难的任务时，你必须全面考虑一切。”故选D。