III. Put
in the right form of pronoun.

Don't take …
(my/mine)
pen! Take … (your/yours)!
What was …
(your/yours)
mother doing?
… farm is as
rich as … (our/ours/their/theirs).
This office is
… (their/theirs).
Those are
Victor's books. The books are … (mine/his/hers).