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A small boy and his father were walking back to their home．It suddenly began to rain hard ．They did not have their umbrellas with them and there was nowhere to hide from the rain,so they were soon all w___,and the small boy didn't feel happy．For a long time while they were walking back to their home through the rain,the boy was thinking．Then at last he turned to his father and said to him,"Why does it rain,Father?It isn't very nice,is it?No,it isn't very nice,but it's useful,Tom," answered his father．"It rains to make fruit and vegetables g___ for us．" Tom thought about this for a moment,and then he answered,"Then,why does it rain on the road,Father?"