My father, who liked to listen to Mexican music whenever we were within transmitter range of the border, used to say that the Mexicans couldn't write a song without using the word "corazon" (heart). Well I say the Irish can't write a song without using the word "morning."

So:

18) the walk you take should be:
a. Just as the day is a dawnin'
b. One fine morning, all in the month of June
c. When the sun she rises, early in the morning
d. One May morning, all in the month of June.

19) If you mention the name of a month in your song, it must be one of:
a. May b. June

20) Otherwise, to denote the time of year you must use a holiday ending in "mas":
a. Martinmas
b. Michaelmas
c. Christmas