Blank (i):
The phrase is "to (i) _______ from a scholarly monograph only those passages that serve one's immediate purpose."

This means cherry-picking - taking only what you want.
- A. extract indiscriminately - "Indiscriminately" contradicts "only those passages that serve one's purpose," which is highly selective.
- B. glean selectively - Perfect: "glean" means to gather/collect, and "selectively" matches the purposeful extraction.
- C. reconstruct faithfully - Opposite meaning; the practice bypasses the structure, not faithfully reconstructs it.
(i) = B. glean selectively

Blank (ii):
"That such a practice effectively (ii) ______ the reader, placing the author's carefully wrought structure at the mercy of the researcher's private agenda..."
Giving the reader free rein to cherry-pick clearly empowers them.
- D. disorients - Not supported; the practice doesn't confuse the reader, it gives them control.
- E. empowers - Exactly right.
- F. humbles - Opposite; the reader dominates the text, not the other way around.
(ii) = E. empowers

Blank (iii):
"The gradual atrophy of the capacity to (iii) ______ on its own terms."

The loss is the ability to engage with a work as the author intended, respecting its structure and argument.
- G. engage with a text - Could work, but "on its own terms" more precisely refers to engaging with the text as it is rather than cherry-picking.
- H. evaluate an argument - Fits perfectly: the ability to evaluate an argument on its own terms is exactly what's lost when one only extracts convenient passages.
- I. imitate a methodology - Doesn't fit "on its own terms" naturally, and not directly supported by the context.
(iii) = H. evaluate an argument

Final answer:
Blank (i): B. glean selectively
Blank (ii): E. empowers
Blank (iii): H. evaluate an argument