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6) the air in the london underground is changed
every quarter of an hour [how often…? ] and the temperature is maintained at 69-79 degrees
fahrenheit all year round. 7) the trains of the future will be operated by automatic drivers.
[whom…? ] 8) the first escalator was installed in the london underground in 1911. [when…? ] 9)
the new car will be tested on the mountain roads. [where…? ] 10) a lot of roads in the usa were
built by private companies [what…? ] and are paid to use; they are called toll [платный] roads. 11)
at the factory young workers are trained to use the new equipment. [who…? ]