Oh ok! The theme of this is to not take your friends for granted.
The best answer here is rolling admission. Rolling admission means that you can apply whenever you'd like and you'll find out if you are admitted once your application is received and reviewed.
For late admission and regular admission, colleges will require a due date to ensure they are able to sort through all of the applications they receive before the deadline. Open admission deals with the requirements that a college requires for a student to attend.
<span>This is an analogy that you need to complete in order to see what the final word should be. So, exciting is an adjective that describes the noun thrill. So, in order to finish the analogy, you need a noun that the adjective difficult refers to. That noun could be ordeal, hardship, trouble, torment, torture, etc. You need a word that means "something difficult," so any of those words could be the correct answer.</span>