<p>If "since" is used, you don't need a semi-colon. A semi-colon to join two stand-alone sentences. By adding "since," you join the two sentences with a conjunction.</p>
<h1>25:</h1>
<p>Wrong idiom. The correct usage is "to change" not "of changing"</p>
<h1>27:</h1>
<p>"To be" is the wrong verb tense. "To be" is in the infinitive form whereas the correct answer is "as," which is in the present tense.</p>