An art gallery It's somewhere...

1.the assistant of the director. te director's assistant2.the nephew of sir charles.   sir charles's nephew 3.the birthday of my boy-friend.  my boy-friend's birthday 4.the duties of men-servants.   men-servants' duties 5.the last letter of my mother-in-law .   my mother-in-law's last letter 6.the recent statement of president bush.  president bush's  recent statement 7.the early poems of robert burns .   robert burns's  early poems 8.an interval of ten minutes .   ten minutes'  interval 9.a distance of five miles.   five miles'  distance 10.the crew of the ship.      the ship's crew 11.the population of england.  england's   popullation 12.for the sake of economy. economy's sake 13.the mother of mary and john   mary and  john's mother (если мать у них общая) 14.the rooms of the daughter and the son. daughter's and son's rooms  15.the new house of the parkers.   parkers' new house 16.the latest record of the champion. champion's   latest record