This was also marked incorrect: "ou si l'on préfère les activités sportives" (specifically the "l'"). I thought it was correct to place an "l" in that context (i.e., before a vowel")?
Freeform Writing Exercise A1
It could be because you have put a capital letter to samedis?
I think the first sentence would be: ....ma soeur fait la natation tous les samedis.
And the l'on: this is a higher register of language. It isn't wrong but may just not have been recognized as correct because it wasn't programmed to do so.
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