I took a point away from my placement test when I tried to use "owns" instead of "has"

It's called a pastry store or a bakery. no one says cake store in the US.

"Một" for "a". Sometimes it is not on sentences and you get marked wrong for using "the", sometimes not. Is there a method to this madness or can we chalk it up to inconsistency? Inquiring minds want to know.

What is going on here? It's marking words which are written perfectly correct as typos.