<p>
E, No error. I will evaluate the answer choices in order.</p>
<p>(A) “on the diagnosis” is the proper prepositional phrase following “research” (the phrase research on is proper).</p>
<p>(B) “increasingly” properly modifies “sophisticated”: the rate of the technology’s becoming sophisticated is positive–i.e., the technology is increasing in sophistication, so it is *increasingly-sophisticated<a href=“hyphen%20used%20for%20illustration”>/i</a>.</p>
<p>(C) “in its treatment” is grammatically correct because “in” properly follows “the use of . . . technology” (where is it used? it is used in the treatment of heart disease) and “its” is not ambiguous because it logically refers to “heart disease.” The words “diagnosis” and “treatment” are very similar words, so it’s not clumsy at all to follow “diagnosis of heart disease” with “its treatment.” The use of “its” is very logical in this sentence, so it isn’t really problematic. There isn’t really a clear line drawn concerning whether a pronoun is ambiguous or not: you just have to have a “feel” for it. Don’t over-analyze, but at the same time learn to recognize any obvious errors. (Just because there are multiple singular pronouns preceding “it” does not mean that “it” is necessarily ambiguous.)</p>
<p>(D) “is” is grammatical because it is singular and follows “condition,” which is also singular.
E, No error. </p>
<p>(A) “but” means “except” or “besides.” “No one but a fool” encompasses only a fool, and no one else.</p>
<p>(B) “readily” means “promptly” or “immediately.” No one but a fool would lend money in an instant, as if it were warranted. . . .</p>
<p>(C) “is known” is grammatical; it is a predicate (e.g., in John is big, “is big” is the predicate) with a past participle (“known”). </p>
<p>(D) “to be” is grammatical after “known.” “known as” works, too. I don’t know how to explain it.
E, No error.</p>
<p>(A) “carefully” properly modifies “planned”: The way in which they planned is careful.</p>
<p>(B) “for each” is grammatical. “for” is a coordinating conjunction, meaning “because”: It was obvious that the candidates planned carefully for the debate, because. . . .</p>
<p>(C) “answer to” is grammatical because it follows “each” (hence is “answer” grammatical) and precedes “the opening question” (“to the . . . question” is proper).</p>
<p>(D) “having been” is grammatical. It refers roughly to the instance of finishing rehearsal and being good to go for the debate. If you have studied, then you finished studying and are presumably ready for the exam. If the answer to “each answer to the opening question showed evidence of having been rehearsed,” then each answer has been rehearsed and was ready to be made before the debate.
[quote]
4). (For) any mayor of a vast metropolitan area, an (understanding of) current issues in all districts (is) not only (desirous) but also vital. (No error)<a href=“D”>/quote</a>, “desirous.” “Desirous” should be “desirable.” “Desirous” modifies the subject of the desire: The people are desirous of peace. “Desirable” modifies the object of the desire: Peace is desirable.
No error.</p>
<p>(A) “because of” is proper because it is an introductory adverbial phrase that logically extends from the clause “the final miles . . . were difficult.” They were difficult because of X. Because of X, they were difficult.</p>
<p>(B) “exceptionally” properly modifies “hilly.” The terrain’s feature of having many hills is exceptional.</p>
<p>(C) “were difficult” is proper because “were” is plural as is “miles.” Miles can be difficult.</p>
<p>(D) “me” is grammatical because it is in the objective form, as required by the preposition “for.” You say for me, not for I, because a preposition requires the objective form of a noun, called the object of the preposition.
A, “to her family.” It should be “by her family.” It follows “considered,” which comes from the verb consider. Who did the considering? The family. Therefore, the baby was considered precocious by her family. “To” doesn’t fit because it denotes some sort of direction of the consideration, rather than an expression of the agent, or doer, of the consideration (i.e., who did it).
No error.</p>
<p>(A) “To those of us” is proper. “Us” is objective as required by the preposition “to.” “Those of us” is a proper prepositional phrase.</p>
<p>(B) “had heard” is proper. The past perfect form is logical since it logically follows the simple past “the news . . . was not surprising.” It is used to differentiate between the two past actions: We know the “hearing” (“had heard”) came before the news.</p>
<p>(C) is proper: “talk about” is proper.</p>
<p>(D) “was not” is grammatical because “news” takes a singular verb, at least in America. (Whether some words take singular or plural verbs generally may vary in different parts of the world.) The news was not surprising is proper; The news were not surprising is improper.</p>