Ответ:
- Whose desk is that? — It’s mine. (b)
- When is your birthday? — The thirteenth of May. (e)
- Whose books are these? — They’re ours. (f)
- Are these his pencils? — No, they’re hers. (d)
- How old are you? — Thirteen. (c)
- Is that your calculator? — No, it’s his. (a)
