Can someone please help me with inventing some good arguments?

Please excuse my poor english.. I'm native dutch but I'm trying hard to not make dumb mistakes :P.

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So, next month starts the spanish class at school and i really want to join it but there's only 1 class and a lot of schoolmates are going to enroll. However, there's only one condition.. You have to write a cover letter (or motivation letter?) and you need to have good arguments like why do you want to follow spanish class etc. There's only one problem: I can't even invent any good points xD.. Can someone please help me?

Ok so maybe this will help?

- I have French class and most of my schoolmates have German class.. French is a romanian language and so is Spanish.. I've read that spanish and french is a little bit similar?

- I want to follow the spanish class so badly and i've waited for 3 years until school gives the chance to follow Spanish.

- If I say something like: yeah I have spanish family and I want to talk to them so I need to follow Spanish class blabla.. I don't think they'll believe me because I'm Indonesian and I have an asian appearance xD.

- I'm good at learning languages.