句型转换（共5小题，计5分）
My brother wants to join the music club. (改为一般疑问句）
_____ your brother want to join the music club?
My mum’s birthday is on 7th October. (对划线部分提问)
______ is your mum‘s birthday?
It is her new sweater. (改为复数句）
______ their new sweaters.
Do you know Mary is from America? (否定回答）
No, I ______.
How much are these yellow socks? (改同义句）
How much is this ______ of yellow socks?