Ереведите предложения, выбрав правильную форму сказуемого (active or passive). 1) new models of lightweight carriages (are putting; are being put) into service on the japanese railways. 2) a number of monorails (are operating; are being operated) in different parts of the world. 3) the new material the scientists (are experimenting; are being experimented) with will be used in rolling stock construction. 4) i know that these engines (are producing; are being produced) in minsk. 5) the process of railway construction (is increasingly mechaniz-ing; is being increasingly mechanized).