need help with some simple grammar

<p>So, here's two improving sentence question that i have no idea why the correct answer is correct...</p>

<ol>
<li>When Beethoven's music was introduced to the public for the first time, they found it difficult to understand and unpleasant to listen to. </li>
</ol>

<p>i thought it was correct as is, but the answer was:</p>

<p>When the music of Beethoven was introduced, the public found it difficult to understand and unpleasant to listen to. </p>

<p>Why is the original wrong? </p>

<ol>
<li>Tabloid newspaper jumped at the news of two stars long rumored to be dating who finally admitted to their relationship. </li>
</ol>

<p>once again, i thought it was correct as is, but the answer changed "who finally admitted to their relationship" to "finally admitting to their relationship"
why do i need to change admitted into admitting?</p>

<ol>
<li><p>Because the word “they” is vague, a common error in grammar questions. The reader does not know who “they” is because it could be referring to two different things.</p></li>
<li><p>The sentence sounds awkward because of the placement of “who”. It needs to be eliminated, thus changing the tense.</p></li>
</ol>

<p>Good questions!</p>

<p>These aren’t CB questions are they? I think they’re terrible, especially the second one. The suggested answer for it is grammatically correct but extremely awkward. A better fix would be to put commas around “long rumored to be dating”.</p>

<p>I agree. These are disastrous questions to practice with!</p>

<p>Oh okay I see, thank you! I think I sort of get it now, but I had another question :d</p>

<p>The National Film Registry established by Congress in 1988 in an effort to protect the artistic integrity of motion pictures. </p>

<p>I got the right answer, which was to change “established” to “was established”. To me the reason was basically because the original didn’t sound right to me. But can anyone explain to me the grammatical explanation?</p>

<p>I think it is a fragment, the original sentence didn’t have any verbs but the correct choice had the word (was) which is a verb.</p>