Answer:
darkness, an object, shadows... Many things can cover up someone's view. Also blindness. A blindfold can cover someone's view was well.
Explanation:
This is all as if we were talking literally. If we were talking, let's say, morally, we would say darkness, fear, despair, etc. :)
d) unnecessary comma.
what do you want to do
I used an external USB in my computer yesterday.
Hope this helps!
