معنی gone down یعنی چه ؟؟

It is three in the morning, and you are awake.  Not gently awake. Not the soft surfacing of someone who will drift back  down in a minute. You are awake the way a light is on. Your body is  exhausted — it has been asking for sleep for hours, and it is asking still. But  somewhere above the exhaustion, in a lit room of its own, a voice is talking.  And it will not stop.

The new industrial zone is a major cause of.............pollution in the northern part of the province.  A- audible  B- visual C- atmospheric  D- aromatic

برای یادگیری زبان چه راهی  رو پیشنهاد میکنید؟ازصفر میخوام‌شروع کنم(خودآموز)