2. 1. The London Underground was the … underground system in the world
first
2. It is more than … years old.
140
3. There are more than … tube stations.
280
4. The shortest escalators on the system has … steps. 50
5. The Jubilee Line Extension was the most expensive railway line ever built. It cost … million per kilometer.
$330
6. All the escalators do the equivalent of … round the world trips every week.
two
7. The early escalators were made of … .
wood
8. Tube carriages originally had …. windows. no
9. The designer of the tube map was only paid … guineas for his original job.
five
10. The air in the underground is on average … hotter than the air on the surface.
10 C

3. L i n k i n g w o r d s .