Go to sparknotes.com & search the name of your book, and it'll give you ALL the information you need!!
Answer:
Don't worry, I can take care of myself.
To determine if someone talking is telling the truth, watch for body language. IF the person is fidgeting, keeps looking away, or stumbles upon their words, there is a high possibility they aren't telling the truth.
Ask yourself if what they are saying is possible or makes sense
If you want to explain to a foreigner how to learn when to use these words, you can say that the go from more general to more specific (in: more general, at: more specific).
in: for objects inside other objects, or for location in a big context: year, country,
on: on top of other objects, or for location in middle-scale contexts: day, street
at: for location on a very small scale: moment (exact time), at specific address<span />
