If you don't have someone to help you, then you can fill in the blanks yourself.
However, this will be more fun if you use it like an "ad-lib" where you cannot see the picture and the other person asks you to name a noun, adjective or verb to help you fill in the missing blanks.
This should be obvious, but your words need to be appropriate.
noun= person, place, thing
adjective= a word to describe something
verb= an action word
Have fun and sing your silly version of this song to someone! Bet it will make them laugh :)