<p dir="ltr" style="text-align: justify;"><span><span style="">This question is a simple sentence that fits the pattern: S + V + O. The subject is “Six Tower _____ the AW building,” followed by the verb “is going to house”, and the object is “the new regional office of Jacob and Associates.”</span></span></p><p dir="ltr" style="text-align: justify;"><span><span style="">Let’s focus on the subject “Six Tower _____ the AW building.” The blank should be filled with a coordinating conjunction that connects the two nouns of the subject. Among the four choices, only (B) and </span><span style="">(D)</span><span style=""> can be used in this way. </span></span></p><p dir="ltr" style="text-align: justify;"><strong><span style="">Subject-verb agreement rule:</span></strong></p><p dir="ltr" style="text-align: justify;"><span><span style="">Now, we need to look at the verb "is going to". The verb is singular. Based on the rule of Subject-verb agreement, </span></span>t<span style="text-align: start;">he correct answer is (D) </span><span style="text-align: start;">or</span><span style="text-align: start;">. </span></p><p dir="ltr" style="text-align: justify;"><span style="text-align: start;">When “or” is used to connect two nouns that are used as the subject of a sentence, the singularity or plurality of the subject depends on the second noun. In this case, the second noun is “the AW building”, which is singular. </span></p><p dir="ltr" style="text-align: justify;"><strong>Other options:</strong></p><p dir="ltr" style="text-align: justify;">(B) and - if "and" is used in this sentence, then the subject will be plural, and the verb should be “are going to house” instead of “is going to house”. Therefore, choice (B) is eliminated. <span style="text-align: start;"><br></span></p><p dir="ltr" style="text-align: justify;"><span><span style="">(A) </span><span style="">yet - "yet'</span><span style=""> is a coordinating conjunction too, but it connects two independent clauses, not two nouns. </span></span></p><p dir="ltr" style="text-align: justify;"><span><span style="">(C) </span><span style="">neither</span><span style=""> - "neither" can only be used in the paired conjunction “neither…nor…” if used as a conjunction. </span></span></p>