阅读下列短文，根据短文内容填空．在未给提示词的空白处仅填写1个恰当的单词，在给出提示词的空白处用括号内所给词的正确形式填空．请在答题卡指定区域作答．

A

Why do we dream？Scientists aren't completely sure，and they have diverse______11   （idea）．Dreams might be a side effect of memory making．When you sleep，your brain sorts through everything_____12   happened during the day，trying to link new experiences to old memories. As it  13______（connect） things，your brain tums them into a story，and you get a dream．

B

Sam is an in-real-life streamer（播主），and he live streams himself just going about his day．While riding his bike home______14   a cold night，he came across a sad-looking elderly woman wandering the streets by herself．The poor woman wasn't able to give him any information about______15   she lived．Sam walked her to a nearby convenience store so that she could_______16  （safe） wait for the police to take her home．

C

There_______17  （be） a dramatic rise in the number of extreme weather events over the past 20 years，  18________（cause） largely by rising global temperatures，according to a new report from the United Nations．From 2000 to 2019，there were7,348 major natural disasters around the world，  19______（result） in USD2,970 billion in economic loss．Much of this increase can be due to climate change．The findings show a critical need   20______（invest）in disaster prevention.