French language Q&A Forum

in the lesson, there is an example "Il s’agit de la réforme agraire"

the answer is given that With a modified, specific noun, use de + definite article.

The English translation is given as "It’s a question of land reform" which seems to me to be a non-specific noun.

Can anyone explain why land reform is a specific noun in this case, when in English it appears to be a non-specific noun in this case, i.e. a general question of land reform, not "It's a question of the land reform introduced in the 2017 amendments."

All the other specific noun examples appear to use the definite article in the English translation

 I write a daily journal in French and was just trying to write that I miss doing something. I cannot decide whether that has to be manquer à or manquer de. I have been lacking the time to do it, which makes me think manquer de. But I have been missing doing the activity in an emotional sense. I really wish that I could do it just as I really wish that it weren't winter or that I could go back to a certain place.

Can someone help me out and tell me which one to use? Manquer à and de is  one of those things I haven't fully mastered when I was A2, I'm afraid. 

(1) J'aimerais aller dans le collège. (2) Je veux aller dans la jungle. (3) On va aller dans le bureau

"dans" in these 3 sentences mean "to". Can I conclude that 'dans' and "à" are interchangable when they mean "to"?