#28 49 Einstein seated?
https://www.dropbox.com/s/owdrzjemf3curhm/%D0%B8%D0%B7%D0%BE%D0%B1%D1%80%D0%B0%D0%B6%D0%B5%D0%BD%D0%B8%D0%B5_viber_2020-06-16_21-19-05.jpg?dl=0

In this text question I would choose to use 'sitting', alas, there's no such an option. What would you choose, why?

This interesting memorial showing Albert Einstein (49)___seats/has seated/seated/seat_______ on a (50)___three-step________bench of Mount Airy (North Carolina) is present at the National Academy of Sciences,
Washington DC. The bronze statue is shown (51)__holding________ a paper with mathematical
calculations.
Plus, there is a star map at the (52) __atatue's________ base decorated with several metal
studs representing the sun, moon, stars, planets, and other astronomical objects. It is
(53)__interesting________ that the astronomers from the U.S. Naval Observatory helped position all
these objects accurately.

Question

#28 49 Einstein seated?
https://www.dropbox.com/s/owdrzjemf3curhm/%D0%B8%D0%B7%D0%BE%D0%B1%D1%80%D0%B0%D0%B6%D0%B5%D0%BD%D0%B8%D0%B5_viber_2020-06-16_21-19-05.jpg?dl=0

In this text question I would choose to use 'sitting', alas, there's no such an option. What would you choose, why?

This interesting memorial showing Albert Einstein (49)___seats/has seated/seated/seat_______ on a (50)___three-step________bench  of Mount Airy  (North  Carolina)  is  present  at  the  National  Academy  of  Sciences,
Washington DC.  The  bronze  statue  is  shown  (51)__holding________ a paper with mathematical
calculations.
Plus,  there  is  a  star  map  at  the  (52)  __atatue's________   base  decorated  with  several  metal
studs  representing  the  sun,  moon,  stars,  planets,  and  other  astronomical  objects.  It  is
(53)__interesting________ that the astronomers from the U.S. Naval Observatory helped position all
these objects accurately.

Answer

Seated is the answer. It is more of a passive statement. Someone arranges for the statue to be positioned in a particular place. 
You can also be seated.somewhere like at a wedding. Someone gives you a.particular seat at which to sit...it has your name card etc.

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