<ol>
<li>In the nineteenth century, reproductions of cathedrals or castles made entirely of ice was often a popular feature in North American winter carnivals.
(a) was often a popular feature
(b) often were popular features
(c) often was featured popularly
(d) often being popular features
(e) have been featured popularly</li>
</ol>
<p>I narrowed it down to b and e. I chose E but B is the correct answer. I just don't see the difference b/w the two</p>
<ol>
<li>(Among) the discoveries (made possible by) (the invention of) the telescope (they found) that dark spots existed on the Sun in varying numbers.</li>
</ol>
<p>I put E but the answer is D. I think this is because the sentence is comparing discoveries to "they" but I'm entirely sure what you would do to (they found) to fix it.</p>
<ol>
<li>More than forty years (have passed) (since) a quarter of a million people marched on Washington, D.C. , (in an attempt) (to secure) civil rights for Black Americans.</li>
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<p>I put C. The comma after D.C. confused me. I thought "in an attempt" should have been "attempting." The correct choice is E</p>
<ol>
<li>The famous filmmaker (had a tendency) (of changing) his recollections, perhaps (out of boredom) (at having) to tell interviewers the same story over and over.</li>
</ol>
<p>I first though I saw two errors here. "Tendency of changing" and "boredom at having." I chose D since it sounded more awkward than B but I don't understand the rule here.</p>