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Under the city streets

Câu hỏi: Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
Under the city streets
While skyscraper offices and elegant apartment blocks remain the public face of most major cities, these cities also have a mass of secret tunnels and .......(27)...... pipes below ground which keep everything working. This other world exists, forgotten or neglected by all but a tiny number of engineers and historians.
For example, there are more than 150 kilometers of rivers under the streets of London. Most have been covered over and, sadly, all that .......(28)...... is their names. Perhaps the greatest loss to the city is the River Fleet, a once great river which previously had beautiful houses on its banks. It now goes underground in the north of the city and flows into the River Thames by Blackfriars Bridge.
The London Underground has 1,000 kilometers of underground railway tracks winding under the capital and more than 100 stations .......(29)...... street level. Along some underground railway lines, commuters can sometimes catch a brief glimpse of the platforms of more than 40 closed stations which have been left under the city. .......(30)...... some are used as film sets, most lie forgotten. Some have had their entrances on the street turned into restaurants and shops, but most entrances have been .....(31)...... down.
A. hide
B. hiding
C. hidden
D. to hide
Phương pháp giải:
Kiến thức: Từ loại
Giải chi tiết:
Trước danh từ "pipes" (ống nước) cần điền tính từ.
A. hide (v): ẩn, giấu đi
B. hiding (V-ing)
C. hidden (adj): ẩn, ngầm
D. to hide (to V)
While skyscraper offices and elegant apartment blocks remain the public face of most major cities, these cities also have a mass of secret tunnels and (27) hidden pipes below ground which keep everything working.
Tạm dịch: Trong khi các văn phòng cao chọc trời và các khu chung cư sang trọng vẫn là bộ mặt công cộng của hầu hết các thành phố lớn, những thành phố này cũng có hàng loạt đường hầm bí mật và đường ống ẩn dưới mặt đất giúp mọi thứ hoạt động.
Đáp án C.