Теория:

Sentences to speak about London Underground. (Предложения для того, чтобы говорить о Лондонском метро).
  
subway-252793_960_720.jpg
 
London Underground was built in 1863. It is known as the "Tube". It was the first metro of the world. Now there are 10 underground lines and almost 300 underground stations.
Источники:
https://pixabay.com/en/subway-train-subway-station-252793/