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What is the difference between Оставшиеся в живых and Выживший. Why wouldn't you use the initial one?
The same thing. The first one is just too pompous and doesn't fit in the flow of your story.
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What is the the difference between вдруг,внезапно and неожиданно?
внезапно - suddenly, abruptly
неожиданно - unexpectedly
вдруг - suddenly but it is colloquial so I didn't include it in your text, which is definetly in official style, cuz it reminds me of a news report
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Один мость в юга-западном Китае рухнул vs Рухнул мост на юго-западе Китая >> Why is it wrong to use the adjective юге-западный?
В юго-западном Китае рухнул мост - this is okay but it sounds like юго-западный Китай is like the brand new country or a special officially separated or divided area of China
На юго-западе Китая рухнул мост - this doesn't claim anything besides the fact that the bridge collapsed somewhere in the south-west of China.
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машины начало трясти vs машины началися вытрясти >> Here why you chose to use начало instead of началися?And why do you use the neutral form of it?
Firstly, началися is not a word, начались is
Secondly, машины начало трясти - начало doesn't belong to машины but to some unknown dummy subject, which was apparently the source of the trembling of the cars. Literally it corresponds to this English sentence - Something started to shake the cars.
Thirdly, I could have named the cars to be the pefrormers of the "starting to shake" action. But for that I need just the usual verb and not a reflexive one:
Машины начали трястись.
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I wrote в реке because I thought that the car and outher stuff fell in the river and the action is completed. In your version в реку it is like they are going on the way to the river if I am not mistaken.
You're not mistaken. But you were mistaken about the first thing.
Что-то упало в реку - this implies that something wasn't in the river in the first place but somewhere else but it sure fell in the river after all
Что-то упало в реке - this implies that something was in the river in the first place and it fell inside the river, perhaps deeper or something ;)