Correct Answer: D

Rationale: The correct answer is 'D - Mr.' The salutation is the formal title used before a person's name, which in this case is 'Mr.' Other choices are incorrect as '1600 Pennsylvania Ave.' is the street address, '20003' is the zip code, and 'Ryan' is the recipient's name.

Correct Answer: D

Rationale: 'Paroxysm' is the correct answer as it refers to a sudden, violent seizure or outburst. The other choices are incorrect because 'revelation' means a surprising and previously unknown fact, 'nutrient' refers to a substance that provides nourishment, and 'contraption' means a machine or device that is strange or unnecessarily complicated.

Correct Answer: D

Rationale: The term 'posterior' refers to the back of the body. Therefore, the correct answer is 'Back.' Choices A, B, and C are incorrect. 'Topmost' and 'Lowermost' do not specifically refer to the back of the body, and 'Front' is the opposite of 'Back.'

Correct Answer: B

Rationale: The correct answer is 'B' because 'form' is misspelled, it should be 'from'. In the given sentence, 'form' is incorrect as it should be 'from' to indicate movement from one place to another. The other choices ('patient,' 'nurse,' 'missing') are spelled correctly and are relevant in the context of the sentence.

Correct Answer: C

Rationale: The correct answer is 'C: Hers.' The possessive pronoun 'hers' does not require an apostrophe. The use of 'her's' with an apostrophe is grammatically incorrect. Choices A, B, and D ('Backpack,' 'Student,' and 'Recognize') are all spelled correctly and are grammatically sound in the sentence provided.