It was reported that a fire broke out in a tall building in Beijing on Thursday afternoon. No one was killed in the fire. The building, which caught fire, is near the three-tower shopping and office complex(综合体) named Xihuan Plaza. One of the three towers was in heavy smoke because of the polyfoam（泡沫塑料）outside. The fire was put out at about 3:34 pm, 16 minutes after the firemen received alarms（报警）.
   Witnesses said the fire broke out at about 3:15 pm. The shopping center had people inside evacuated（疏散）shortly after the fire. By 4:50 pm, all the workers from the center returned.
   The fire happened on a ____ , when people were working in the office.
   When the firemen put out the fire, the fire lasted for____  minutes.
   pThe workers went back to work ____  an hour after the fire was put out.
   Though the fire frightened people there, it killed ____ .
   The fire didn’t____  until it was 3:34.

如果你发现你所在的社区居民在社区内乱倒垃圾，污染了环境，你应该(     )

“一方水土养一方人”，不同地区受自然环境的影响，人们的生产方式、生活习惯、文化传统等方面也有很大的差异。完成下题。