un conocido means B. an acquaintance.
I am pretty sure its Tacos.. its not that they don't eat it's just not one of their main plate.. all the others are part
I'm not sure of the vocab you're supposed to use, but I think it's: Manuel Carmen, estoy (I am) muy contento por ellos, pero eso (that) es algo enfermo y no puedo ir.
Hope that helps and is somewhat correct!
Coman I think thats what Google said anyway ;)
