Thank you for your help, everyone!
Sorry that this message is in English.
(Not even in Spanish!)
Now I am in Toronto, Canada.
I cannot read or type in Japanese.
I will fly to Cuba tomorrow.
I have a question.
Before, I was going to pay for the taxi in Cuba in Canadian money.
But Today, at Toronto Airport, I exchanged most of my Japanese yen to Euro.
Because the lady working there strongly recommended me to do so.
I do not know if that was a good idea yet.
So, now I have muchos Euros, 20,000 Japanese Yen, and 70 Canadian Dollars.
Do you think I can pay for the taxi in Euro or Canadian dollars in Havana?
or, do I need CUC?