(1) were built
(2) were owned
(3) are owned
(4) was created
(5) are kept
(6) are allowed 
(7) wasn't kept
(8) have been only invented / were invented 
(9) was done
(10) is still lived
(11) are only shown
(12) are kept
(13) are looked
(14) are given 
(15) have been given