Write the correct possessive adjective or pronoun for these sentences

1 Whose camera is this? Is it ..yours. ? (you)
2 Excuse me, those are ,.our.. seats, (we)
3 Is it..........your.......... suitcase or.........his................ ? (you/he)
4 Has the dog had ............its...........food? (it)
5 They're not ...........my........keys - they're..............hers.......... (I/she)
6 I don't think its ..........your...............room: I think it's............theirs............. (you/they)
7 The police asked me for ...........my...............address. (I)
8 Have you got...............your............... pen, or would you like to borrow..........mine................? (you/I)
9.................Their.............. garden is bigger than...........ours............. (they/we)
10 I think this is............my............... book. Oh no, it's............yours................. (I/you)
11 The decision is .............theirs..................(they)
12 The cat wants ..............its.................dinner, (it)
13 You know it's not...........your.................... money. It's............mine............ (you/I)
14 It isn't ..............his...............car, it's ..............hers.............(he/she)
15 It wasn't ............my.................mistake, it was...........theirs............... (I/they)
16 Have you met..............their.............. mother? (they)
17 ............Her............parents say the decision is ...........theirs..........(she/they)
18.............My.......... brother hasn't got a phone, so he uses..........ours........... (I/we)
19 ............My................car wasn't working, so I used ........his.................(I/he)
20..............Our.......... house is smaller than........theirs........... (we/they)