Where were the small girl and her mother having a walk?

A small girl and her mother were taking a walk in the country when it suddenly began to rain very hard．They did not have their umbrellas with them，and there was nowhere to hide from the rain，so they became wet soon，and the small girl did not feel happy．
    While they were walking home through the rain，the girl kept thinking．At last she turned tO her mother and said，“Wrhy does it rain，Mother?It isn’t Very nice，is it?”
    "No，it isn’t very nice，but it’s useful，"answered her mother．"It rains to make the fruit and vegetables grow for us，and to make the grass grow for the cows and sheep．"
    The girl thought for a few seconds, and asked, "Then，why does it rain on the road too, mother?"