<p>I got wrong in these questions but still don't understand why. Can someone explain to me the reasons?</p>
<ol>
<li>Most endurance athletes find that regular training is essential to improve race times, but athletic talent also plays a big role in determining how fast an athlete will be on race day.</li>
</ol>
<p>I think that there is no error in the sentence, but the book says that "to improve" is wrong.</p>
<ol>
<li>The student researchers discovered that the fieldwork on the archaeological dig was far more boring than they first expected, having discovered nothing for months except for an old coin that was not very valuable.</li>
</ol>
<p>(A) expected, having discovered nothing
(C) expected: they discovered nothing</p>
<p>(C) sounds great, but what's wrong with (A)?</p>
<ol>
<li>A chain of nine volcanic islands in the middle of the Atlantic Ocean, the Azores located over a thousand miles from anything else.</li>
</ol>
<p>The book says that "located" is wrong, probably lacking preposition, I think.</p>
<ol>
<li>Eating garlic has long been regarded as a means of warding off malaise, and scientific research has shown that it does have some therapeutic value.</li>
</ol>
<p>Although I chose "No error", which is the correct answer, I wonder whether the pronoun "it" is ambiguous ("it" may refer to "eating garlic" or "scientific research").</p>
<p>Besides, I would like to know in which order you often do the writing section (I mean the long one). I always do it in the order the questions are presented; however, my teacher told me to do the "Improving paragraph" first, then "Improving sentences", then "Identifying errors" since doing so will save time and prevent me from feeling rushed in the last minutes with the tricky paragraph questions.</p>