《theirs》《mine》《his》《yours》《hers)

《theirs》《mine》《his》《yours》《hers)
1.this is my pen.it's _______
2.these are your rulers.they're______
3.is this theirdrum?yes,it is.it's_______.
4.are this drum？yes，it is.it's_______
5.is that Jenny'sdoll？yes，it is.it's________