Complete the passage with words from the box twice attempt capacity wonders explored

Complete the passage with words from the box.

twice       attempt          capacity             wonders         explored                   regarded       unknown          formations                subterranean                measurements

With (1) ……………………of over 200 meters (656 feet) wide and 150 meters (492 feet) high as well as a length of 9 kilometers (5.6 miles), Son Doong Cave is the largest cave in the world.

Before 2009, Malaysia’s Deer Cave was (2) ……………………as the largest cave in the world until a group of scientists from the British Cave Research Association (3) ……………………and studied the Son Doong Cave finding it was in fact over (4) ……………………the size of Deer Cave.

Named by BBC News, the “most beautiful cave on the globe” makes this one of the great natural (5) ……………………of Asia. It is a mountain river cave featuring a fast flowing (6) ……………………river. Son Doong Cave is mostly comprised of limestone that has over time shaped into some of the tallest stalagmite (7) ……………………in the world. Within Son Doong Cave visitors will find it is so big that it contains its own jungle and river and has the (8) ……………………to be able to fit a 40-story skyscraper inside. The source of the river still remains (9) ……………………to this day with future plans of the British Cave Research Association to return soon and (10) ……………………to solve the many mysteries this cave holds.