Correct Answer: D

Rationale: The word 'disintegrates' means to break apart into smaller parts or fragments. In the sentence, it describes the process of the substance breaking down in the mouth. Therefore, the most appropriate meaning is 'Fragments.' 'Evaporates' means to turn into vapor, 'Fizzes' refers to the production of bubbles, and 'Deviates' means to depart from the norm, making them incorrect choices in the context of the sentence.

Correct Answer: A

Rationale: The correct answer is A: 'Mostly.' The word 'principally' means mainly or mostly. It is used to describe something that is primarily or predominantly true in a given context. Choice B, 'Clearly,' is incorrect as it does not reflect the primary meaning of the word. Choice C, 'In our opinion,' is incorrect as it does not capture the essence of 'principally.' Choice D, 'Royally,' is incorrect as it does not align with the definition of the word.

Correct Answer: D

Rationale: When a symptom is exacerbated, it means that it is made worse or intensified beyond its usual level of severity. This can lead to increased discomfort, pain, or other negative effects associated with that particular symptom. Choice A is incorrect because exacerbation does not imply that the symptom is not dangerous. Choice B is incorrect as exacerbation does not necessarily mean disfiguring. Choice C is incorrect as exacerbation does not always specifically refer to pain, but to any worsening of a symptom.

Correct Answer: D

Rationale: The word 'elated' means to be ecstatically happy or joyful. Similarly, 'delighted' also means to be extremely pleased or filled with joy. Therefore, 'delighted' is another word that could be used to express the same meaning as 'elated.' Choices A, B, and C are incorrect. 'Edified' means to instruct or enlighten, 'confused' means to be unclear or bewildered, and 'flabbergasted' means to be astonished or amazed, which do not convey the same meaning as 'elated.'

Correct Answer: A

Rationale: The term septic typically refers to something that is infected or contaminated with harmful bacteria or toxins, often used in the context of septic tanks or infections. Therefore, the correct answer is 'Infected.' Choices B, C, and D are incorrect. Odorous means having a smell, terminal means leading to death or the end of something, and vigorous means strong or energetic. These terms do not capture the essence of septic as being infected.