<li><p>The countries of Western Europe (have discovered) many benefits (in associating) (with one another), whether ( it does so) directly or indirectly.
I got this one , the correct answer should be “doing so” ??</p></li>
<li><p>Several (recently discovered) photographs (taken by) Augustus Wilson in 1847 (have) recently (been put) on display at the institution in D.C.
i marked taken by as the wrong answer, but its E, mm its a lil confusing. taken by is a participle right? but it says 1847, so why not “took”, i know when u see took by, it sounds weird,but hey this is grammar -.- it doesnt make sense sometimes lol. so please explain this one.</p></li>
<li><p>(Extending) along several city blocks (are) a row of ginkgo trees, (their leaves) (turning) a brilliant yellow now that summer is over.</p></li>
</ol>
<p>the answer is obvious,but i wanna go beyond that, this sentence has a weird structure, why isnt the second part wrong lol,i mean it looks like comma splice to me. “their leaves turning” -.- is the whole sentence even complete?
i need clarifications on this one because what happen if the “are” is "is " , then im so doomed =S</p>
<li>Kamen empire, after (enduring for) over a thousand years, (is) believed to have fallen (into decline) when trade centers (shift) outside its boundaries.</li>
</ol>
<p>should be “shifted” right?</p>
<li>Not very particular (in) nesting (sites), house wrens (may nest) in birdhouses, mailboxes, building crevices – even in pockets (of) hanging laundry.</li>
</ol>
<p>I was fluctuating between A and E, pure luck,i got the right answer, so whats wrong with A? :)</p>
<li>(At) the reception (were) the (chattering) guests, the three-tiered cake, and the lievely music that have become ( characteristic of ) of many wedding celebrations.</li>
</ol>
<p>dont tell me this is the copular verb thing -.-
i got this wrong,so im suspecting it is the copular verb thing… can someone explain?</p>