<p>Hi,</p>
<p>While I was practicing some official tests I faced some questions that I don't know their explanations. So, could you guys tell me why the right answer is right and why the wrong is wrong??</p>
<ol>
<li><p>The baker explained that the custard would be firmer (by allowing it to cool slightly before eating it).
(A) by allowing it to cool slightly before eating it
(B) by allowing the slight cooling of it before eating
(C) by allowing it to cool slightly before being eaten
(D) if allowed to cool slightly before eating it
(E) if allowed to cool slightly before being eaten
*Correct answer:E
*My answer:D</p></li>
<li><p>(While) copper, (unlike gold) , ( not considered) a glamorous metal, it (has long been) one of the world's valuable commodities.
*Correct answer:E
*My answer:D</p></li>
<li><p>Had Theresa (rode) a bicycle instead (of driving) to work, the additional travel time (would have been) offset by the time she took (to find) parking. No error
*Correct answer:A
*My answer:C</p></li>
</ol>
<p>4.( Years ago) we hiked the Inca trail without a tent or stove, (having been) (insured) by a friend that (we would find) shelter and firewood along the way.<br>
*answer:C
*My answer:B</p>
<ol>
<li>Most states in the United States had enacted child labor laws by 1920, (but not until 1938 when) the Fair Labor Standards Act established a national minimum working age.
(A) but not until 1938 when
(B) but it was not until 1938 that
(C) not until 1938 did
(D) it was, however, not until 1938 that
(E) and not until 1938 when
*Correct answer:B
*My answer:A</li>
</ol>