用下列单词的正确形式填空。
(1)Good luck to _____ (you).
(2)Best ______ (wish) to you .
(3)You’re ____ ( I )best friend.
(4)What are you _____ (write) in your letters?
(5) _____ (wish) you happiness every day.
(6)There ____ (be) about forty letters here.
(7)This one ____(be ) for Amy.