Spanish language Q&A Forum

I had a question on a kwiz that was marked "nearly" or "almost there"  

Aquel restaurante, ________ me recomendó Alberto, tiene unos postres exquisitos.That restaurant, that Alberto recommended, has some exquisite desserts.
el cual was "correct"que was "nearly"
In the question and answer just below mine, an answer says that que and el cual are interchangable.  Why was this answer not just marked correct?  How do we know which one to use to get "correct" answers?  Does the "nearly" count against me?

For the phrase: "... accompanied by rich hot chocolate" > "[una deliciosa rosca] acompañada de un rico chocolate caliente" - 

- the hint which you gave us should read: "the adjective 'rich' is reinforcing 'hot chocolate' " ... (Instead, you put: "the adj. 'hot' is reinforcing 'hot chocolate' ").

In a quiz question (20% is a small number),       why is the answer el "20 %" not accepted? The lesson seems to suggest that either that or El '20 por ciento" should be ok. Thanks.

In one of the questions, Cabrán is the very first word of the sentence, and there is no other part of the sentence (like a mid-stream capitalization.  I was marked only partially right for capitalizing it and it "corrected" me to lower-case.

Cabrán todo mis libros en esa caja?

Isn't that correct?  The quiz said it was supposed to be

cabràn todo mis libros en esa caja?

Que tiene que tener un DNI para poder votar?     

Hello,

I was confused as to why it's (y voy a salir de casa temprano) and not (y voy a salir la casa temprano)

hola no entiendo la diferencia entre "terminar por/participio" y "terminar de". por favor cuanteme!

Suggestion, along with having vocabulary words presented before each exercise also have the lessons that one should have done/review prior to doing the exercise.  For example, somehow I did missed the lesson on conjugating in the near future lesson, and I was lost with those sentences.  Thanks.