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1. AROUND - adverb (It relates to the word looked in the sentence. The word around tells how he and his friends looked.)
2. BEFORE - adverb (The word before is an adverb when it is not followed by a noun, and preposition if it is followed by a noun. In this case, it is an adverb.)
3. into
4. at
5. in
6. on, around
7. for, of
Allusion is a reference to something. It's to imply a meaning based on an external thing.
The act of copying someone else's idea and not giving credit to the original source is called plagiarism.
