Spanish language Q&A Forum

Can you please elaborate a bit on when the "que" is necessary in "gracias a que"? Is there a reason it's needed for nuestros padres but not for la colaboración? 

I used 'murieron' instead on 'murió' and was marked wrong.  So, I assume that 'ejército' is always considered singular in spanish?

You implied that we should use "Adentrarse en" but "Adentrarse por" was given in the answer without a reference to "Adentrarse en". Which is correct?

In another sentence you advised lit' "we dined on some sandwiches" but "en" was not included in "cenábamos unos bocadillos". A bit confusing, no?

The mini kwiz had this possible answer which I did not select, but which was apparently correct: "Nuestros padres compraron helados a nosotros." Isn't "a nosotros" the same kind of pronoun as "a ti" or "a ella"? Why would this not require a "nos" before compraron the way "a ti" or "a ella" would require "te" or "le"?