Rule: Vocabulary of Business Operations. The phrase 'to a country with lower labor costs' clearly indicates a move from one place to another. 'Relocate' means to move to a new place and establish one's home or business there. This is the precise term. Option (a) 'centralize' means to concentrate control under a single authority. Option (b) 'consolidate' means to combine things into a single, more effective whole. Option (d) 'expand' means to become larger, but not necessarily to move.

Rule: Vocabulary - Appearance vs. Reality. The word 'Despite' signals a contrast between her outward appearance and her inner feeling. The word needed is one for outward appearance or behavior. 'Demeanor' means outward behavior or bearing. A 'calm demeanor' contrasts perfectly with being 'extremely nervous'. Options (a) 'agitation', (b) 'trepidation' (fear), and (d) 'perturbation' (anxiety) are all words for her inner feeling of nervousness, not her outward appearance.

Rule: Vocabulary of Pollution. 'Industrial waste' is a pollutant that makes the river unsafe. 'Tainted' means contaminated or polluted. It correctly describes the negative effect of the waste on the river. Options (a) 'replete with' and (d) 'abundant in' mean filled or well-supplied with something, but they don't carry the strong negative connotation of pollution. Option (b) 'teeming with' usually refers to being full of living things (e.g., teeming with fish), which is inappropriate here.

Rule: Verbs of Praise and Punishment. 'Disruptive behavior' is a negative action that would result in punishment or scolding, not praise. 'Reprimanded' means to express sharp disapproval or criticism to (someone) because of their behavior or actions. This is the appropriate word. Options (a) 'extolled', (b) 'lauded', and (d) 'commended' are all synonyms for 'praised', which is illogical in this context.

Rule: Vocabulary of Reputation. The phrase 'he is a man of his word' indicates that his integrity is perfect and cannot be doubted. 'Unimpeachable' means not able to be doubted, questioned, or criticized; entirely trustworthy. This is the perfect adjective. Options (a) 'questionable', (b) 'dubious', and (d) 'flawed' are all negative words that mean the opposite.

Rule: Verbs of Obscuring. The context is that the mist made the peaks impossible to see, so the verb must mean 'covered' or 'hidden'. 'Shrouded' means to wrap or cover for burial, or more generally, to cover or envelop so as to conceal from view. This word is often used with mist or fog. Options (a) 'exhibited', (b) 'revealed', and (d) 'illuminated' all mean to show or make something visible, which is the opposite of the intended meaning.

Rule: Vocabulary of Ambiguity. A response that 'fueled further speculation' must have been unclear or ambiguous. 'Equivocal' means open to more than one interpretation; ambiguous. This is the precise word for a deliberately unclear response. Options (a) 'candid', (b) 'forthright', and (d) 'lucid' all mean clear, honest, and direct, which would likely reduce speculation, not fuel it.

Rule: Phrasal Verbs and Context. The phrase 'confronted with' means to be faced with or presented with a problem or difficult situation. This perfectly fits the context of having to make a 'difficult choice'. Options (b) 'bestowed with', (c) 'endowed with', and (d) 'entrusted with' are all used for giving someone a positive thing, like a gift, quality, or responsibility, not a difficult choice.

Rule: Inference from Context. Winning 'in the last few seconds' implies that the game was very close and difficult. 'Hard-fought' means contested with great determination and effort, which accurately describes such a victory. Options (a) 'decisive' and (b) 'resounding' would imply an easy win by a large margin. Option (c) 'perfunctory' means carried out with minimum effort, which is the opposite of the situation described.

Rule: Verbs of Harmonization. The sentence implies a conflict between old beliefs ('conservative upbringing') and 'new ideas'. 'Reconcile' means to find a way in which two situations or beliefs that are opposed to each other can agree and exist together. It correctly describes the mental process of making two conflicting things compatible. Options (c) 'integrate' and (d) 'assimilate' are about combining things into a whole, but 'reconcile' better captures the sense of resolving a conflict. Option (b) 'alienate' means to cause someone to become isolated or estranged, which doesn't fit.