Answer:
topic sentences state the main idea.
John's choices influenced the plot and end of story because of the choices been made of John.
Answer:
Three small dogs.
Explanation:
That would be a sentence fragment because it's not a complete thought.
Answer:
Get a bigger bedroom or a smaller train.
Explanation:
Of the bedroom is too small then if you get a smaller train the train won't be so big anymore and can now fit. If you get a bigger bedroom then the train will fit because there is more room.