1. George Stephenson constructed the world's first steam locomotive in 1829. 2. Substances produces by diesel-powered trains are harmful.
3. Different national rail networks have been developed over the years.
4. The 21st century is the age of railways transport.
5. Eco-friendly electric traction is being widely used now.
Что за учебник??? в набери в и всё готово будет
1. -
2. have tried
3. has gone
4. has started
5. has had
6. has bought
1)а
2)Some
3)some
4) an, an, some
5)some
6)a