<ol>
<li>In those cities in which public transportaion is adequete, fewer traffic problems occur and pedestrians are rarely involved in accidents.</li>
</ol>
<p>i put B because since its cities, shouldn't it be where?? but it is actauly no error</p>
<ol>
<li>Intense preoccupation on technique appears to be the one trait that great piants.....</li>
</ol>
<p>apparently this is the wrong idiom for preocuaption. what is the write idiom</p>
<ol>
<li>The quality of multivitamin tablets is determined by how long its potency can be protected by the manufacturer's coating material</li>
</ol>
<p>the error here is "its". i put e because doesnt it refer to quality, which is singular?</p>
<ol>
<li>I think in which can be used interchangeably with where, the former is just more formal. Not entirely sure</li>
<li>The correct idiom is preoccupation with</li>
</ol>
<p>Neither of them is more formal. “where” should be used for physical location; “in which” is generally more for conceptual location. The adequateness of public transportation is a concept. Some argue that they are interchangeable, however; I prefer the distinction.</p>
<p>Unlike the store, the adequateness of the public transportation is not physical. With that said, using “where” would not be ungrammatical (according to most authorities at least).</p>
<p>
</p>
<p>It’s true that intervening prepositional phrases never contain the subject of the sentence. The sentence does not violate that rule: “quality” is indeed the subject of the sentence. This fact does not make the referrent of the pronoun the subject of the sentence, though. Logically, quality cannot have potency.</p>
<p>i am sorry but i still do not undersnatd. so the its is referring to vitamins rite? so for pronouns, always take the noun closest even if its in a prepoisitonal phrase???</p>
<p>also, maybe i am confusing this with subject verb agreement. is it in subject verb agreement that you cannot use a noun in a prep phrase when trying to make the verb and subject agree? </p>
<p>also, i sitll do not undersnat the in which and where. i understnad tat the transportation is a thing, but its still talking about cities.</p>
<p>What comes after the “where” or “in which” is what affects which you should choose. Just think about it in this way:
[ul]
[<em>]“where” works only for physical location; that is, only use it when a physical entity or set of entities exists</em> in space. For example: “the town where people live” or “the room where he eats.”<br>
[<em>]“in which” works for conceptual location; that is, use it when the entity cannot be located in space. For example: “the book in which he appears,” “the movie in which he runs,” or “the city in which the aura is bad.”
[</em>]“in which” can be substituted for “where,” but using “where” in substitution for “in which” can occasionally result in an ungrammatical colloquialism.
[/ul]
Note my subject-verb agreement: “physical entity or set of entities” is singular because when “or” is used to link two subjects, only the one closer to the verb affects agreement; the singularity of “set” is unaffected by the intervening prepositional phrase “of entities.”</p>