BB: Page 480 problems 25, 28 & 29

Test Preparation SAT Preparation
1

<p>NUMBER 25
"intense preoccupation on technique appears to be one trait"
why is "on" wrong in this sentence? and what should it be?
NUMBER 28
"The quality of multivitamin tablets is determined by how long its potency can be protected"
the answer is C which is "its". whats wrong with its?
NUMBER 29
"The research study reveals startling proof of a constant changing sea floor that comprises the major part of the underwater landscape."</p>

<p>in this question, "part of" is incorrect, once again can anyONE explain why this is wrong?</p>

<p>thank you very much</p>

2

<ol>
<li><p>The correct idiom is “preoccupation with.”</p></li>
<li><p>“It’s” is referring back to tablets, which is plural. It should be “their.”</p></li>
<li><p>According to my book, the error in this one is “constant,” which should be an adverb because it’s modifying an adjective.</p></li>
</ol>