Advance directives are formal instructions that allow patients who are to decide in advance about their future medical care in the event they become unable to make direct medical decisions. An advance directive can assign a person to be a , who can can make medical decisions in case a person becomes .

Choices for the first blank
a. Competent
b. mentally handicapped

Choices for the second blank
a. medical practitioner
b. healthcare agent

Choices for the third blank
a. unwilling to make difficult end-of life decisions.
b. unable to express his or her own medical wishes.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.