for therefore however
Once there lived a rich merchant  and a poor shoemaker in the same house.The merchant occupied the second floor,   [MASK]  the
shoemaker lived and worked in a small room on the first floor.The shoemaker was one of the   happiest  persons on earth.He worked from morning till night, singing merrily.His heart was filled with   joy  , whenever he saw the boots and
shoes  to be repaired  .Now the merchant upstairs was so rich that he   hardly  knew how
much wealth  he had.He was always   counting  over his gold and silver coins far into the night.Even in bed his uneasiness  about his riches kept him   awake  .When at last he had been asleep for an hour or two, up came the song of the happy shoemaker, who was an   early  riser.It continued all day and was a(n)   trouble   to the merchant.Day by day the merchant grew more and more tired through want of   sleep  .He asked a wise friend of his how he could put an   end  to the shoemaker's song.