Переведите предложения, выбрав правильную форму сказуемого (active or passive). 1) regular operations in the sorting yards (have already planned; have already been planned). 2) numerous changes (have made; have been made) in the design of the vehicle. 3) the major marshalling yard (will have modernized; will have been modernized) with the latest operating equipment by the end of the year. 4) after the signalling (had improved; had been improved) a more frequent service of trains was provided. 5) powerful track-laying machines (have developed; have been de-veloped) for the construction of railroads.
