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