12. Составьте предложения из предложенных в каждой цепочке слов.
1) first, in, 1829, George Stephenson, the, world’s, steam, locomotive, constructed.
2) harmful, trains, are, by, diesel-powered, produced, substances.
3) over, the, have, national, years, different, networks, developed, been, rail.
4) is, railways, the, 21st century, of, transport, age, the.
5) being, electric, traction, used, eco-friendly, is, now, widely.