sentence: There are four people participating the BMX dirt biking competition. sentence:  They are doing incredible stunts on their bikes by jumping up high over ditches and steep terrain. sentence:  One of the bikers takes a fall after he leaps over a hilly road. sentence:  Several other bikers go in full speed over hilly terrain and steep hills. sentence:  People are gathered to watch and participate in the BMX event. sentence:  The bikers continue doing their stunts as they go over hilly terrain and hilltops. sentence:  The winners of the race are awarded trophies and certificates. sentence:  They proudly raise their trophies high up to show their accomplishment.