ask think grow begin have go walk rain turn get

ask think grow begin have go walk rain turn get
One day,a little boy and his father____out after supper.While they___a walkin a park,it suddenly_____to rain.they didn'thave raincoats,so soon they_____very wet.the little boy felt unhappy.
While they____home in the rain,the boy thought of something.Then he____to his father and____,“Why does it rain?Do you think it is nice?''
"It isn't nice,Ithink.But it's useful."answered his father."It___
to make flowers and vegetables grow for us,and to make the grass____
for cows and sheep."
The boy____about this for a few seconds,and then he said,"Then,why
does it rain on the road too,daddy?"