9.
1) Alan's car is new and his friends love it
2) These are my dogs and the black one is Peter's
3) We always stay at my friend's house when they are away.
4) I like Dave's garden, it's so big, nor like my parents'
5) I often take my neighbour's dog for a walk when she asks me.
10.
1) Anna's
2) John's, sister's
3) Teacher's
4) Parents'
5) Jamess'
6) Kate's, children's
11.
1) Who's
2) Whose
3) Who's
4) Who's
5) Whose
6) Whose