<ol>
<li>Tornado form when large air masses of different temperatures [collide, which results from either a change in the direction or the speed of the wind]
A same
C collide as the result of a change in either ....
Why isnt A correct? The answer is C</li>
<li>[Its settlement] of the strike demonstrated [that] the company can [maintain] strong labor relations, treat its employees well, [while still making] a reasonable profit
The answer is D and I cant understand why so as well as how D should be changed.. I tried to rewrite the context: while it still makes a reasonable profit, the company can maintain strong labor relations". According to this version, why cant we shorten the sentence by saying "while still MAKIN a reasonable ...." Isnt this similar to the expression :"DRIVING at night, he left the town at sunrise"</li>
</ol>
<ol>
<li><p>The word “which” refers to a concept that is implied in the sentence, but not to a specific noun or noun phrase, as it should. If the sentence were revised to include a word like “collision,” which is a noun, then the word “which” could actually refer to something.</p></li>
<li><p>The problem is simply that a series of three or more verb phrases needs to be joined by the word “and” before the last phrase. One correction would substitute “and make” for the phrase labelled D. An alternate correction would replace the comma after “relations” with the word “and.”</p></li>
</ol>
<p>@WasatchWriter thank you so much for the explanation. I misunderstood the problem of question 2 
I have another question to ask " the policy is economical but makes the company less appealing" is there anything wrong with “but makes”? </p>
<p>Given what you’ve shown me, “but makes” looks fine. In the context of a larger sentence, it could still be wrong. For example, this would be a mess: “Although the policy is economical but makes the company less appealing”</p>
<p>@WasatchWriter [what was] most apparent at the food science convention [was] the industry’s continuing [emphasizing on] health-promoting [ingredients].
Why C? I thought C is correct since continue doing sth is appropriate?
Thanks in advance</p>
<p>@WasatchWriter Another 3 difficult questions:
- John singer, who [until recently] was [regarded by some] as [no more than] a society painter, [is now receiving]…
The answer is C, why so? - Foresters discovered that trees killed by acid rain had begun to die 4 years [earlier even though the trees had shown no signs of disease then]
A. Same
C. Without any signs of disease shown then.
I cant understand why C is incorrect - Some viewers condemn the program [to be] inappropriate
To be is wrong, why so?</p>
<ol>
<li><p>“Continuing verb+ing” is not idiomatic. “Continuing noun” is idiomatic, so in this case “continuing emphasis” would be correct.</p></li>
<li><p>“no more than X” generally describes quantities, as in “John is no more than five feet tall.” The correct idiom here would be “nothing more than”</p></li>
<li><p>For one thing, there is nothing wrong with the original. C is <em>wrong</em> because it lacks the word “earlier.” The sentence makes no sense without it.</p></li>
<li><p>When the point being made is that X already is Y, the correct idiom is “condemn as.” When you condemn X “to be” Y, it’s like giving a command that X will be Y in the future. (But even that is a little clunky to my ears.)</p></li>
</ol>
<p>@WasatchWriter supposing that earlier was added to the context, would C be still wrong?</p>
<p>@WasatchWriter also can u give me an example of “condemn to be”?</p>
<p>Something like this, maybe: The imperial judge sentenced Michael to be alone on Ghost Island for the rest of his life.</p>
<p>Thank you guys :D</p>
<p>@WasatchWriter hi there, seems like I still need some help with writing questions.
Of the (more than) 50 (entries in) the high school science fair, Sarah’s project (was) declared (more innovative) by the panel of six judges.
The answer is D but i cant make out why</p>
<p>“most innovative” or “the most innovative” would sound more idiomatic than D. We would normally use “more” if it were followed by “than” or if the elements of the sentence being compared were plural, as in “The more innovative projects each won a prize.”</p>
<p>Thank you :D</p>
<p>@WasatchWriter this is a paragraph improving question
Most of my classmates have no idea what they want to do when they graduate. [They are simiar to me. Many different things are interesting to them. My classmates are not] sure how to decide which one is most important
A.like me, they are interested in many different things, but they are not
C. My classmates, similar to me, find many different things interesting, but not
The answer A but why is C wrong or inappropriate to use</p>
<p>@WasatchWriter
- [opposite to] most people i know, Annie, a good photographer [herself], actually [enjoys seeing] the photographs that her friends take [on their]vacation
The answer is A but i think opposite to is idiomatic - Not very [particular in] nesting [sites], house wrens [may nest] in birdhouses, mailboxes-even in the pockets of hanging laundry
The answer is A - [At] the reception [were] the [chattering] guests, the three-tiered cake, and the lively music that have become [characteristic of] many wedding celebrations.
The answer is no error. However i thought “characteristic” should plural since “have become” indicates a plural noun, any idea? - The name “transferware” [comes from a nineteenth-century technique for which] a pattern is engraved onto a copper roll, printed on tissue paper, and transfered onto earthenware dishes.
B. Comes from a nineteenth-century technique according to which
C. Comes from a nineteenth-century technique whereby
D. Is a nineteenth-century technique wherein
The answer is C but why not B or not D</p>
<p>1 “opposite to” is not idiomatic in that context, at least not in American English. “unlike” would work better.</p>
<p>2 “particular about” is the correct idiom</p>
<p>3 “characteristic” is being used as an adjective here, so there is no plural.</p>
<p>4 B is close, but the difference is subtle. “according to X” normally refers to a plan or model or set of instructions that is being followed. The implication would be that the technique and the steps that are described are in fact different, when really they are the same. In normal usage, no one would notice or care about a distinction like that. So B is not exactly wrong. C is just better.
D is wrong because it would be calling “the name” a technique.</p>
<p>@WasatchWriter thank you so much, here are some more difficult ones, i hope i’m not exhausting you
- One example of people with time-management problems is students [who spent most of their free time praticing sports, and then, later, they are too tired for concentrating] on homework
C. Who spend most of their free time practicing sports and then are too tired to concentrate
D. Spending most of their free time practicing sports, but later are too tired to concentrate
Why is D wrong? Is it because “but” is inappropriate to use in the context - In the past children were content to entertain themselves with kitchen pots and balls of [twine rather than high-priced electronic toys now]
A. Same
B. Twine, not the high-priced electronic toys now
C. Twine; now they want high-priced electronic toys
C is the answer but why A and B are wrong? - [Although] Gail was told that she [possesses] remarkable musical talent, she [should not] be [oblivious from] the need for constant practice
This question bewildered me the most. Obviously oblivious from is unidiomatic but is it illogical to use “possesses” when “Gail was told” is used? Shouldn’t we change to the past tense to match “Gail was told”? - In Gee’s Bend, Alabama, [traditionally made] quilts [are aired] outdoors on sunny spring days, attracting local quilters who enjoy [this] display of one another’s [creations]
The answer is no error, but shouldnt “creations” be changed to singular form “creation” to grammatically match “one another”? - There is a special relationship between a conductor and the members of an orchestra, [when at its best can be creative and at its worst, destabilizing]
B. When at their best can be creative and at their worst, destabilizing
D. Which at its best can be creative and at its worst, destabilizing
D is correct but why B isnt? How can the relationship can be creative??
Thank you :D</p>
<ol>
<li>That’s a parallelism problem; your two verbs are “spending” (gerund) and “are” (not gerund). </li>
<li>A and B are incorrect because the “now” construction is made much clearer in choice C by breaking it up into two independent clauses. </li>
<li>You can tell that verb tense isn’t the topic being tested on this sentence because two verbs, “possesses” and “be” are both present tense, and you can’t change both. </li>
<li>You can’t disprove that one person made more than one quilt, so “creations” won’t be wrong. </li>
<li>“When” can only be used for a time or period (Example: The 20th century was a time WHEN venture was tantamount to societal ties.) The “which” in choice D directly refers to the noun “relationship,” so that choice is correct. </li>
</ol>
<p>Hope that helped! 
</p>
<p>1D is wrong because it does not use parallel construction. If the first part starts with “spending” the second part should also start with an “-ing” verb form. This creates some other problems too.</p>
<ol>
<li><p>In both cases it is the word “now” at the end. The original sentence is structured like this: “In the past, X rather than Y.” “In the past” applies to X and Y both. If you attach “now” to Y, then you are trying to claim something that happened in the past is also happening now. “Rather than” or “not” cannot change that because, as I said, “In the past” applies to everything. 2C is OK because the effect of “In the past” stops at the semicolon.</p></li>
<li><p>Many writers would agree with you and use the past tense consistently throughout the sentence. Switching to present is not “incorrect,” however, since Gail’s talent continues to exist in the present. Fortunately, you don’t have to worry about that. “Oblivious from” is obviously unidiomatic (“oblivious to” is correct"). Once you see that error you can stop looking for others.</p></li>
<li><p>That would be true only if each quilter comes with exactly one creation. The implication here is that they each bring more than one.</p></li>
<li><p>You are looking at the wrong thing. The error is simply the word “when.” It doesn’t refer to anything related to time, and that would be the only reason to use it. Also, “when” cannot function as a subject, so the verb “can be” has no subject. “which” clearly refers to “relationship” and also functions as a subject for “can be.”</p></li>
</ol>