While skyscraper offices and elegant apartment blocks remain the public $(1)$________ of most major cities, these cities also have a mass of secret tunnels and hidden pipes below ground which keep everything working. This other word exists, forgotten or neglected by all but a tiny $(2)$________ of engineers and historians.
For example, there are more than $150$ kilometers of rivers under the streets of London. Most have been $(3)$________ over and sadly, all that $(4)$________ is their names. Perhaps the greatest loss to the city is the River Fleet, a once great river which previously had beautiful house on its $(5)$________ . It now goes underground in the north of the city and $(6)$________ into the River Thames by Blackfriars Bridge.
The London Underground has $1,000$ kilometers of underground railway track winding under the capital and more than $100$ stations below street level. Along some underground railway lines, commuters can sometimes catch a $(7)$________ glimpse of the platforms of more than $40$ closed stations which have been left under the city. $(8)$________ some are used as film sets, most $(9)$________ forgotten. Some have had their entrances on the street turned into restaurants and shops, but most entrances have been $(10)$________ down.
$1.A.$ face $B.$ outline $C.$ surface $D.$ top
$2.A.$ number $B.$ amount $C.$ total $D.$ few
$3.A.$ covered $B.$ protected $C.$ hidden $D.$ sheltered
$4.A.$ stays $B.$ stops $C.$ remains $D.$ keeps
$5.A.$ borders $B.$ coasts $C.$ banks $D.$ rims
$6.A.$ gets $B.$ flows $C.$ leaks $D.$ lets
$7.A.$ rapid $B.$ brief $C.$ fast $D.$ sharp
$8.A.$ Despite $B.$ Unless $C.$ Although $D.$ Since
$9.A.$ lie $B.$ last $C.$ live $D.$ lay
$10.A.$ pulled $B.$ broken $C.$ brought $D.$ cut