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Son Doong Cave is (15) ___________ in the Phong Nha-Ke Bang National Park, which was designated a Unesco World Heritage Site in 2003. Not only is the park home to the world's largest cave, but it actually has hundreds of cave systems as well.

Only one tour operator has the (16) ___________ to bring travellers on the trek into the cave, and tickets for 2017 expeditions went on sale this week and, according to the tour company, Oxalis Adventure Tours sold (17)  ___________ in the first 20 hours.

Oxalis Adventure Tours has noted that the company may only organise tours for 500 to 600 people during the January to August season. The company has also noted that (18) ___________ safety and conservation matters, the government of Quang Binh province only authorizes Oxalis to bring tourists into the cave.

The tickets are sold to the first applicants who meet all of the health requirements, as the six-day trips require travellers to be able to trek about 50 kilometres, and navigate through the caves. The cave has only been open to tourists since 2013 and, according to Oxalis, fewer people have seen the inside of the cave than have (19) ___________ the Everest. The tours cost US$3000 per person.

15. A. situated                         B. locate                     C. position                   D. placed

16. A. possibility                     B. ability                     C. law                          D. capable

17. A. on                                 B. off                           C. over                        D. out

18. A. due                               B. since                       C. because of              D. because

19. A. climb                            B. visited                     C. submitted                D. topped