V. Give the correct form of each word in the brackets. 18. In the early years of the twentieth century, motor _______ was a popular sport. It was very exciting. (race) 19. Last month Birmingham schoolgirl Becky Carter and her family took part in The Big Switch Off, an experiment to live without ________ for a month. (electric) 20. _________, many H'Mong people believe that daughters should work, and going to school is only for the sons. (tradition)