Why was only 'çok' but not 'birçok' accepted here?
I have added it.
is the passive form of 'demek' 'denmek'? and i'm guessing it's not applicable here because the 'many things' were not a quote?
Yes, this is true. For me it is applicable here, I don't see any problem :)
söylendi : dendi
I added as an alternative.
thanks very much!
Why is "çok şeyler" not accepted for "many things"? Is it because of çok?
Yep, you do not use the plural suffix after "çok." :)
First 'hakkında' was accepted and now it is suddenly must be 'pek'...
There is no "hakkında" and no "pek" in the sentence.
Why "söylenmiş" is not accepted?