补全对话。
A:Can I help you?
B:Yes,( ).Today is mother's day.I'm looking for a present( )my mother,but I have no( )what do buy.
A:Maybe you can buy her some flowers.
B:Great!But( )flowers shall I buy,roses or carnations?
A:I think carnations are( ).They mean happiness,sweetness and love,They are( )mothers.
B:Hoe( )are they?
A:Thirty yuan a bunch.
B:OK.I'll ( )it.Here;s the money.
A:Thank you and best( )to your mother.Goodbye!
B:Bye!