Thanks iCake. If they are fully understandable it is good. It is my first goal to be able to formulate understandable phrases.

What is the difference between Оставшиеся в живых and Выживший. Why wouldn't you use the initial one?

What is the the difference between вдруг,внезапно and неожиданно?

Один мость в юга-западном Китае рухнул vs Рухнул мост на юго-западе Китая >> Why is it wrong to use the adjective юге-западный?

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?

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.