I assume not because when I typed this sentence into MS Word, "The opportunity to study in foreign countries where religious history originated would be an uniquely unforgettable experience," it underlined the "an" before uniquely and corrected it to "a." Perhaps it is an exception, and besides, it does sound better to say "a" instead of "an" before the word "unique."
A word to put in front of 'on' to make a new word is up (upon).
The word "next" can be put in front of "step" to form the phrase "next step."
No, typically a comma is not used in front of the word "while" when it is used as a conjunction to join two clauses.
Watercress.
When you put a word in front of a quote, it is called an attribution. This is used to indicate who is speaking or to provide context for the quote.
windowpane
PORridge
YES!!! If you can put the word to' in front of it, then it is a verb. Hence 'to shoot'.
The prefix "un-" can be put in front of the word "describe" to create the word "undescribe."
cellmateplaymateteammateworkmatestalemateshipmateroommateseatmatecheckmateclassmateschoolmatemessmatestablemate
foot
beverly