Выберите подходящее слово: а) Tom is(their, theirs) friend. b) This is (our, ours) car. It's (our, ours). c) These are Mary's books. They are (her, hers)

а) Tom is(their) friend.

b) This is (our) car. It's (ours).

c) These are Mary's books. They are (hers)