<li>In his new book, Quest for Adventure, the [A]renowned British mountaineer Chris Bonington examines the **past century’s most remarkable expeditions, [C]profiling such explorers [D]including Neil Armstrong, Thor Heyerdahl, and Maurice Herzog. </li>
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<p>D is wrong but what should it be changed to?</p>
<li>The famous filmmaker [A]had a tendency ** of changing his recollections, perhaps [C]out of boredom [D]at having to tell interviewers the same story over and over. </li>
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<p>The answer is B but if that is changed to “to change” wouldn’t that not be parallel structure anymore since D is “at having”. </p>
<li>[A]Having studied hard for the podiatry examination, Charles felt **capable to make distinctions [C]among the various problems [D]associated with the joints in the foot. </li>
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<p>Here B should be “capable of making” but #3 is “to change”. These two seem similar but why are they different?</p>
<li>The museum [A] is submitting proposals **to several foundations [C]in the hope [D]to gain funds to build a tropical butterfly conservatory. </li>
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<p>Again similar questions, why should C be “of gaining”</p>
<li>Widowed in 1859, novelist Margaret Oliphant succeeded [A] to provide for **her own and her brother’s children with the [C]profits from her books, which numbered [D]well over 100 volumes.</li>
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<p>I think this is a tense error. Should A be “in providing”.<br>
I’m confused over when to use infinitives and when to use the -ing form.</p>
<p>Is there some systematic way of doing these questions cuz I always overlook the errors and pick E. Also I have not seem similar questions from BB (these are from the official practice tests, PSATs and QAS) so if there are similar questions in BB can someone point them out. Thanks.</p>