Step 1: Understanding the Concept:
This question tests contextual vocabulary usage where each word must grammatically and logically fit into the specific sentences. Step 2: Key Formula or Approach:
Approach: Match specific collocations. Willpower is commonly described as something that gets "depleted." A job is something one "resigns" from. Step 3: Detailed Explanation:
Sentence I: "resigned" fits the context of leaving a job despite a salary increase.
Sentence II: "shocking" is a valid adjective to compare the nature of truth versus lies.
Sentence III: "depleted" is the perfect term for resources like willpower that are used up. Step 4: Final Answer:
The correct set is (I) resigned; (II) shocking; (III) depleted.