Из активного в пасивный подалуйста)

The letters are delivered at 8.00 by postman This hotel was built two  years ago by someone  A lot of preservatives are used in food in these days by them Has your question been answered by anyone? Your keys were found  on top of the photocopier by somebody Reference books  should not be taken out of the library  The rate of taxation has been increased to forty per cent by them Pencillin was discovered in 1928 by scientist