Iii. перепишите и переведите предложения, выбрав правильную форму сказуемого (active or passive). 1. air-conditioning system always (maintains; is maintained) the optimum temperature and humidity in the carriage. 2. a new high-speed railway line (is building; is being built) in the north of russia now. 3. the flood (has caused, has been caused) considerable damage to the railway track.