Перепишите и переведите предложения, выбрав правильную форму сказуемого (Active or Passive)

Перепишите и переведите предложения, выбрав правильную форму сказуемого (Active or Passive) 1. Powerful track-laying machines (have developed, have been developed) for the building of railroads. 2. The road is closed because the road works (are conducting, are being conducted.) 3. At the first railways, sleepers (laid down, were laid down) along the track; nowadays they (lay down, are laid down) transversely.