Read the text and fill in the gaps with the correct words.
Heart-stopping ... such as mountain biking, ... and skydiving are known as "extreme sports". They are ... more and more people. Rock-climbing, for example, is enjoyed now by more than half a million ... . Only 50000 were doing it in ... .
One of the most extreme of all these sports is BASE jumping. First done in 1980, BASE jumping is jumping off tall ... , towers and bridges, using a ... . It is ... , but, of course, that's why BASE ... love it. Like other extreme sports, it's the risk of disaster that makes BASE jumping so ... . As one BASE jumper puts it, "There aren't many ... in BASE jumping; you either live or die". Some experts ... that extreme sports will become the ... sports of the 21st century. They may become more popular than ... sports games like soccer and baseball. One of the ... is that parents start taking their little kids to extreme sports shows. Besides, teens would like to do these dangerous sports in the near future.