Определите время и залог сказуемого, 1) the first railway bridge was made of timber. 2) at present all-metal eight wheel cars are being built. 3) every year a lot of international and specialized exhibitions and fairs are held in different countries. 4) iron and steel are produced from iron ore.
1)past simple,passive voise
2)preseny continuos.passive voise
3)present simple,passive voise
4))present simple,passive voise