Answer:
1. your
2. their
3. our
4. their
5. yours
Explanation:
This question is not distinguishing between possessive pronouns and possessive adjectives. Here goes a brief explanation to make it clear.
Possessive adjectives are words that indicate a relationship of possession, of belonging, between other words. For example, if a book belongs to me, I can say it is "my" book. Possessive adjectives always accompany the words they refer to. They are: my, you, his, her, its, our, your, and their.
Possessive pronouns have the same function of indicating possession or belonging. The difference is that they do not accompany the word they refer to. They actually substitute it. They are: mine, yours, his, hers, its, ours, yours, and theirs. Example: What a beautiful car! Is it yours?
Thus, in the sentences we are analyzing here, numbers 1 through 4 have possessive adjectives - your, our, and their. Number 5 has a possessive pronoun - yours. But, as stated above, the question is not distinguishing between them.