Here are the odd ones out for each row:

6. A. sit (verb) - all others are nouns.
7. A. live (verb) - all others are verbs or related terms.
8. A. pencil (noun) - all others are related to classrooms (eraser, board).
9. A. where (question word) - all others are objects/common nouns.
10. A. desk (noun) - all others are not specific furniture items.

So, the odd ones out are **A** for lines 6, 7, and 9, and **C** for line 8, and **A** for line 10.