Hang Sơn Đoòng is the world's largest cave, located in Quảng Bình Province, Vietnam. It was discovered in 1991 by a local man named Hồ Khanh and later became famous after being (1)________ by a British caving team in 2009. The cave is over 5 kilometers long, with sections reaching up to 200 meters high and 150 meters wide. It is part of the Phong Nha-Kẻ Bàng National Park, a UNESCO World Heritage site. Inside Hang Sơn Đoòng, you will find a river, a jungle, and unique limestone formations. The cave also has its own weather system, with clouds forming inside (2)________ the large temperature differences between the interior (3)________ exterior. Visitors can see giant stalagmites and stalactites, some of (4)________are the tallest in the world. The journey to Hang Sơn Đoòng is challenging and requires a multi-day trek through dense jungle and rugged terrain. Participants need to be in good physical condition. The adventure is organized by Oxalis Adventure, the only company authorized to conduct tours in the cave. This unique experience offers the opportunity to see untouched natural beauty and understand more about the geology and (5)________of the region
(Adapted form: https://oxalisadventure.com)
Question 1: A. experienced B. explored C. located D. permitted
Question 2: A. because B. although C. due to D. in spite of
Question 3: A. so B. and C. or D. for
Question 4: A. that B. whom C. which D. who
Question 5: A. biodiversity B. destination C. permission D. accessibility
