In all seriousness, repeating 'belonging' in no way answers the question and probably indicates a lack of substance/understanding of the topic. You shouldn't need to use it very often and it's probably best to avoid it.
Nah - you are allowed to use it. Teachers often frown upon it, though, to prevent kids from using it every second sentence. So use it, but only when you need to.
^
As Aerath said, use it only when you need to. However, I strongly suggest you using it because then you're making the belonging aspect of it super, super obvious which teachers pretty much hate.
Even for my essays, I usually only use it in my introduction and possibly my conclusion if i'm in the mood XD