Join the following sentences to make one complete sentence without using 'and','but' or 'so' :
i) NIta asked a riddle. I was unable to solve it.
ii) He is hard working. He is sincere.
iii) The heart attack was mild. Mr Bose stayed in the bed for three weeks.
iv) Everyone was drenched by now. The rain had come down harder.
(i) I was unable to solve the puzzle that Nita asked.
(ii) He is hardworking since he is sincere.
(iii) Though the heart attack was mild, Mr Bose stayed in the bed for three weeks.
(iv) Everyone was drenched by now because the rain had come down harder.