Change the voice ?
47) The in-voice may kindly be sent at the earliest. 
48) We conduct tours in this area. 
49) Please tie your seat belts. Do not get up. 
50) I was requested by him to attend the party. 
51) Did you find the watch? 
52) Are the chairs being arranged by someone? 
53) The books are being sold by the book seller. 
54) The children are being looked after by nanny. 
55) Neha is selling fruits in the market. 
56) Has the police been seen by anyone? 
57) The ingredients are being mixed by mother. 
58) They bought a dog named Polly. 
59) One can't climb cliffs. 
60) Dinesh will paint a landscape.