нужна помощь!!!! что вставить вместо точек !?помогите!

1)if you see a giraff once a YEAR ...remains a spectacle?
he /she /it /they????
2)his composition is much more interesting then ...
your / yours / you / you's ???
3)all....clothes were extremely dirty, and mine especially so?
our's / our / us / ours???
4)the villagers built....new houses?
ourselves / themselves / youself / herself