Correct Answer: C

Rationale: The comparative form of the adjective 'careful' is 'more careful' when comparing two things. In this context, it is comparing the level of care in examining the patient, indicating a higher degree of care than just 'careful.' Choice A, 'careful,' is the positive form of the adjective and not comparative. Choice B, 'carelessly,' is an adverb that conveys the opposite meaning. Choice D, 'most careful,' is the superlative form of the adjective, indicating the highest degree of care, not the comparative form.

Correct Answer: C

Rationale: In this sentence, the word 'utter' best fits as it emphasizes the absolute and complete accuracy of the experiment. 'Utter' means total or complete, and in this context, it conveys a sense of total precision. Choices A, B, and D do not carry the same connotation of absolute precision. 'Extreme' and 'remarkable' may imply a high level of precision but not necessarily absolute or complete precision. 'Great' is a more general term that does not specifically emphasize the completeness of the precision required in conducting the experiment.

Correct Answer: B

Rationale: The word 'meticulous' is synonymous with being very careful and detail-oriented. It describes someone who pays close attention to detail and is thorough in their work. 'Precise' is the best choice among the options as it conveys accuracy and exactness, which align with the nature of someone who is meticulous. Choice A, 'careless,' is the opposite of meticulous, indicating a lack of attention to detail. Choice C, 'indifferent,' suggests a lack of interest or concern, which is not related to being meticulous. Choice D, 'enthusiastic,' conveys a sense of excitement and passion rather than the precision and carefulness associated with being meticulous.

Correct Answer: B

Rationale: The past tense of the verb 'discover' is 'discovered.' In this case, the scientist already found a new species of butterfly, indicating a past action. 'Discovered' is the correct past tense form of 'discover.' The other options do not represent the past tense form of the verb. 'Discovers' is present tense, 'discovering' is present participle, and 'discovery' is a noun, not a verb tense.

Correct Answer: D

Rationale: The correct answer is 'and.' 'And' is the most appropriate conjunction here as it simply adds information about her love for animals without implying cause or effect. It connects two independent clauses in a neutral way, indicating that she loves animals and also volunteers at the shelter. The other choices, 'because,' 'therefore,' and 'so,' suggest a cause-and-effect relationship between loving animals and volunteering at the shelter, which is not the intended meaning in this context.