All but the 3rd one, i think.
Something mysterious happened. It builds tension making the reader want to read more.
A). stage Directions help create a visual, it is describing everything that is on the scene.
The last one. The only scenario where you wouldn't put a comma in the first quote is if it's a completed remark that uses particular punctuation such as a quotation or exclamation mark, but never a period. Hope this helped.
The meaning of this like is simply that you can’t carry every burden on your own and need help from the people around you. two are better then one
