Bob: Do you mind if I play some music
Lily: ______ . I'm writing my assignment.

A．Of course, you can.
B．Certain, you may.
C．Surely, you can ' t.
D．No, please get out.

A．I don' t know Christmas is coming to us.
B．Oh, sorry, haven' t yet. It' s a hard decision to make.
C．You know, she has to decide it herself.
D．You know, not every Chinese considers Christmas as a serious holiday.