Fill in the gaps with the correct question words. Choose from: when, where, who, what, which.

1 A: ... is your uncle's birthday?
B: It's on the 5th of November.
2 A: ... is it?
B: It's a fridge.
3 A: ... bag is Lily's?
B: Lily's bag is the black one.
4 A: ... is she?
B: He's my sister.
5 A: ... are the books?
B: The books are on the shelves.