Answer:
The main or central idea in a story is that story's theme
He was afraid that he world be late for school
Answer:
The dependent clause follows the independent clause in this sentence, so no comma is needed.
Explanation:
When a dependent clause follows an independent clause, there is not need to include a comma as opposed to when the dependent clause is before the independent clause.
In this case the dependent clause being "because her brother’s stereo was turned up to full volume", follows after the independent clause which is, "Beatrice was unable to concentrate on her project". There is therefore no need to put a comma.
It looks sort of like something that would make a bell noise. Maybe the purpose is to move it around, or maybe just for pure decoration.