A place you cannot see, It could be directly behind you or diagnoly behind you. For example, if you where in a car a car directly behind you would be in your blind spot untill you check your mirror.
Maggie's reasons for not experimenting with drugs reflect that she might get caught and end up in jail.
I think this is a pretty easy question to answer yourself. Think about anything that your parents or siblings or anyone really in your life who is an adult has done for you and ways you can gives thanks and show your gratitude towards them. It’s not difficult