Personal pronouns: subject and object

Is that your notebook or _______________________?

• my
• mine

I don't like _______________________ apartment.

• their
• theirs

That's not my problem. It's _______________________.

• yours
• your

Your car is green, while _______________________ is black.

• my
• mine

Isn't _______________________ son older than you?

• their
• theirs

A friend of _______________________ called.

• our
• ours

A friend of _______________________  brother's called.

• her
• hers

He's _______________________  doctor.

• our
• ours

That's _______________________  house, not theirs.

• our
• ours

Is he a friend of _______________________ ?

• your
• yours