91.　 Let’s write to each other and be good pen-friends.

90.　 Please remember me to your parents.

89.　 Please give /send my best regards to your parents.

88.　 I am looking forward to hearing from /seeing you.

87.　 I’m eager to hear from you.

86.　 Many happy returns of the day ! (祝您生日快乐!或敬祝佳节)

85.　 My you live a long and joyful life !

84.　 Hearty congratulations !

83.　 I’m writing with delight to congratulate you on your invention.

82.　 It’s very kind of you to invite me to have a picnic, but I’m terribly sorry that I’m not able to accept your kind invitation.