The term “extreme sports”, which we might have seen on a magazine or a website,     1    (be) becoming more and more common as the concept of extreme sports gains     2     (popular). But what are extreme sports on earth?

During the 1970s and 1980s, the term was used for sports with high risks     3     (involve). Today, however, the sports also include activities that give a feeling of adventure without    4    (necessary) putting a participant’s life in danger. For every extreme sport, there is professional equipment that has been developed     5     (protect) your body, improve your performance and give you    6     advantage in the competition.

Extreme sports cover a wide range. Some     7     (develop) from familiar activities so far, like mountain biking, climbing and drag race. Some may not be well known. For instance, bouldering is a kind of rock climbing     8     no rope is used.     9     usually takes place in an area with large rocks or in climbing center.

Nowadays, such sports have become more popular     10     young people all over the world than ever before.

The International Olympic Committee     1     (delay) the Tokyo 2020 Olympic Gaines to next year because of the threat the COVID-19 poses to the world generally.

    2     the IOC and the 2020 Olympics organizers once considered     3     (hold) the Games without viewers     4     (reduce) the risk of virus transmission (病毒传播), the Japanese government always insisted that the Tokyo Olympic Games would be held in stadiums full of viewers, because the     5     (absent) of sports fans would greatly reduce the level of competition.

Yet the delay of the Tokyo Olympics will have a big impact on Japan’s economy. The direct economic loss could be about $6 billion, mainly because of the increased operating costs,     6     (include) the cost of venue maintenance (场所维护) and repair. Small and medium-sized Japanese businesses in the tourism and catering sectors, most of     7     expenses are made up of labor costs, will suffer the greatest losses.

The delay of the Tokyo Games will also have a huge impact on global sport events. Over the years, international sports events     8     (follow) an Olympic-centric schedule, which ensures that no other global sports events are held during the Summer Olympics. But now it could clash with (冲突) such major sports events     9     the World Aquatic Championships and the World Athletics Championships. Incomplete data suggest the delay of the Tokyo Games     10     (force) at least 33 major sport events to be rescheduled.