Ключевые слова: back, burn, burnt, coal, courage, course, danger, dangerous, difficulty, effort, energy, fast, feet, fierce, fire, flame, hay, hazard, heat, hose, hot, motion, motivation, mud, obstacle, problem, race, rapid, risk, run, runner, running, shoes, smog, smoke, speed, splash, spray, spring, stockholm, struggle, tough, tough viking, viking, vision, warm, water, wet, white,