Possessive adjectives

Fill in the blanks !

Look at (you're / your) room! Wow, (you're / your) really a messy person!
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(Who's / Whose) pencil case is that? (Who's / Whose) so forgetful?
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I think I know (he's / his) dad. (He's / His) an architect.
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Where are the Johnsons? (They're / Their) relaxing in (they're / their) new swimming-pool.
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Look at this strange insect! (It's / Its) legs are very long. I think (it's / its) a tropical bug.