<p>1) A(To stand in) Persepolis in modern Iran and look out, as Darius the First B(must have done), at the immense C(sweep of fields and mountains) is D(to grasp) the vastness of the ancient Persian Empire.</p>
<p>the answer is E, but why B is correct? shouldn't it be must had done because it is in the past?</p>
<p>2) (When thinking about which current television shows have) the potential to become classics, only a few come to mind.
(A) When thinking about which current television shows have
(B) When thinking about which are the current television shows with
(C) When one thinks about which current television shows have
(D) When one thinks about which are the current television shows with
(E) Thinking about current television shows and which of them have</p>
<p>the correct answer is C, but why it's not D?? it looks also fine</p>