1) ....
Need explanations too. Get crackin pugs.
-pH
   1) During the early months of 2009, some economists concluded that the slew of U.S. government 
programs(Plural) created during the fall of 2008 to stabilize an economy marked by an absence of credit, a wave of enormous asset write downs, a precipitous decline in housing prices, and a historic loss of consumer confidence 
has(singular) not succeeded in engendering healthy intra-bank credit flows and reviving depressed equity prices.
A) has not succeeded in engendering healthy intra-bank credit flows and reviving depressed equity prices
B) have(Plural)  not succeeded in engendering healthy intra-bank credit flows and reviving depressed equity pricesC) has not succeeded in engendering healthy intra-bank credit flows and bringing about the revival of
D) have not succeeded 
in engendering healthy intra-bank credit flows 
and to revive depressed equity prices (Not parallel)
E) has not succeeded in engendering healthy intra-bank credit flows along with a revival of depressed equity prices
2)By confronting a devastated economy through actions such as  through his , Franklin Roosevelt both lifted the spirits of Americans across the country and set the United States on a course that helped propel it out of the Great Depression. 
(Only the last parallel element in the list needs an and. There are 2 lists and I have marked them with [])A) launching massive public works programs, and improving the morale of a demoralized nation through his fireside chatsB) and launching massive public works programs, and improving the morale of a demoralized nation through his fireside chats
C) and launching massive public works programs, and by improving the morale of a nation demoralized through his fireside chats
D) and through the launch of massive public works programs, and by improving the morale of a demoralized nation through his fireside chats
E) and launching massive public works programs, and by improving the morale of a demoralized nation through his fireside chats
3)
In his best-selling book The Omnivore's Dilemma, which social critics see as yet another piece of evidence to support their thesis of a burgeoning interest in natural food among Americans, Michael Pollan elucidates industrial farming, explains organic farming, and discusses hunting and gathering food for oneself.A) In his best-selling book The Omnivore's Dilemma, which social critics see as yet another piece of evidence to support their thesis of a burgeoning interest in natural food among Americans, Michael Pollan elucidates industrial farming, explains organic farming, and discusses hunting and gathering food for oneself.B) Michael Pollan, in his best-selling book The Omnivores Dilemma, which social critics see
(active) as yet another piece of evidence to support their thesis of a burgeoning interest in natural foods among Americans, 
elucidates(not parallel in the list)  industrial farming, 
explaining organic farming and 
discussing hunting and gathering food for oneself.
C) In his best-selling book The Omnivores Dilemma, elucidating industrial farming
(The book elucidating is incorrect), explaining organic farming, and discussing hunting and gathering food for oneself, Michael Pollan gives social critics yet another piece of evidence to support their thesis of a burgeoning interest in natural food among Americans.
D) Michael Pollan, in his best-selling book The Omnivores 
Dilemma, serving(book, which server is better) as yet another piece of evidence to support the thesis of a burgeoning interest in natural food among Americans, elucidates industrial farming, explains organic farming, and discusses hunting and gathering food for oneself.
E) In his best-selling book The Omnivore's Dilemma, which is seen by social critics
(passive, active better) as yet another piece of evidence to support their thesis of a burgeoning interest in natural food among Americans, Michael Pollan 
elucidates(not parallel in the list) industrial farming, 
explaining organic farming and 
discussing hunting and gathering food for oneself.
4)
The purring noise of a cat, although most people think that cats purr because they are content, is actually involuntary and is not directly related with the emotion of the cat.A) The purring noise of a cat, although most people think that cats purr because they are content, is actually involuntary and is not directly related with 
(Unidiomatic) the emotion of the cat.
B) Although most people think that cats purr because they are content, the purring noise of a cat is actually involuntary and is not directly related with 
(Unidiomatic) the emotion of the cat.
C) Although most people think that cats purr because they are content, the purring noise of a cat is actually involuntary and is not directly related to the emotion of the cat.D) The purring noise of a cat, 
although most people think that cats purr because they are content, is actually involuntary and is not directly related to the emotion of the cat 
(awkward construction).
E) Although most people think that cats are purring because they are content, the purring noise of a cat is actually involuntary and is not directly related with 
(Unidiomatic) the emotion of the cat.
5) Heightened land erosion, caused by human activity, has many negative effects 
including the following: algae blooms, coral reef destruction, imbalance of the fish population, and the introduction of harmful chemicals to the ocean's environment. 
Tip: The elements in the list should be parallel.
A) including the following: .
B) including: 
(including followed by a colon is incorrect) algae blooms, coral reef destruction, imbalance of the fish population, and harmful chemicals entering the ocean's environment.
C) including:
 (including followed by a colon is incorrect)  algae blooms, coral reef destruction, imbalance of the fish population, and the introduction of harmful chemicals to the ocean's environment.
D) including the following: algae blooms, coral reef destruction, imbalance of the fish population, and harmful chemicals entering the oceans environment
(not parallel to the rest of the elements in the list).E) including the following: algae blooms, coral reef destruction, certain fish populations rising, certain fish populations falling, and the introduction of harmful chemicals to the oceans environment
(not parallel list)..
6)After a storied investment bank recently fired its CEO and hired an outspoken and flamboyant replacement, members of the news media centered their stories on the replacement's claims 
that, based upon his past work at a private equity firm, he can return the investment bank to profitability.Hint : replacements  use of possessive  mean that we do not need that he can returnA) that, based upon his past work at a private equity firm, he can return the investment bank to profitability
B) 
of the ability, based upon his past work at a private equity firm, 
of returning the investment bank to profitability 
(awkward)C) 
of being able to(wordy) return, based upon his past work at a private equity firm, the investment
D) to be, based upon his past work at a private equity firm, able to return the investment bank to profitabilityE) 
that, based upon his past work at a private equity firm, 
he is capable(not needed with the possessive) of returning the investment bank back to profitability
7)The owners of a fast growing tech start-up in Newport Beach organized the firm as a Limited Liability Company (LLC). The owners receive considerable personal liability 
protection from potential lawsuits, and they also avoid some egregious double-taxation that would occur if the company was set up as a C-corporation.
A) protection from potential lawsuits, and they
(redundant pronoun) also avoid some egregious double-taxation that would occur if the company was set up as a C-corporation
B) protection from potential lawsuits and avoid some egregious double-taxation that would occur if the company was set up as a C-corporationC) protection from potential lawsuits, avoiding some egregious double-taxation that would occur if the company was set up as a C-corporation
D) protection from potential lawsuits, and avoid some egregious double-taxation that would occur if the company were
(should be was) set up as a C-corporation
E) protection from potential lawsuits and avoid some egregious double-taxation that would occur if the company were
(should be was)  set up as a C-corporation 
Trying....