Son Doong Cave has become more famous after the American Broadcasting Company (ABC) aired a live programme featuring its magnificence on „Good Morning America‟ in May 2015. Located in Quang Binh Province, Son Doong Cave was discovered by a local man named Ho Khanh in 1991, and became known internationally in 2009 thanks to British cavers, led by Howard Limbert. The cave was formed about 2 to 5 million years ago by river water eroding away the limestone underneath the mountain. It contains some of the tallest known stalagmites in the world - up to 70 metres tall. The cave is more than 200 metres wide, 150 metres high, and nearly 9 kilometres long, with caverns big enough to fit an entire street inside (them). Son Doong Cave is recognised as the largest cave in the world by BCRA (British Cave Research Association) and selected as one of the most beautiful on earth by the BBC (British Broadcasting Corporation). In August 2013, the first tourist group explored the cave on a guided tour. Permits are now required to access the cave and are made available on a limited basis. Only 500 permits were issued for the 2015 season, which runs from February to August. After August, heavy rains cause river levels to rise and make the cave largely (inaccessible). 28. What happened to Son Doong Cave in May 2015? A. It was discovered by a local man named Ho Khanh. B. A live programme featuring its magnificence was broadcast on „Good Morning America‟ by theAmerican Broadcasting Company (ABC). C. It became known internationally thanks to British cavers, led by Howard Limbert. D. It was explored by the first tourist group. 29. Which statement is NOT true about Son Doong Cave? A. Tourists can explore Son Doong Cave daily throughout the year. B. The cave was formed about 2 to 5 million years ago. C. It was formed by river water eroding away the limestone underneath the mountain. D. Some of the stalagmites in Son Doong Cave are about 70 metres tall. 30. The word ‘them’ refers to ______. A. British cavers B. stalagmites C. kilometers D. caverns 31. The word ‘inaccessible’ in the passage probably means ______. A. should not be accessed B. need to be careful C. cannot be reached D. may be flooded 32. From the passage, we know that ______. A. there is a street inside Son Doong Cave B. the cave is always covered with rain water C. few tourists want to come to the cave D. tourists need permission to explore the cave