1、The time flies, we havent seen each other for a long time. All the things here are going on pretty well, I just miss you so much!
时间过得很快，我们已经很久没见了。这里一切都好，就是很想你。
2、It is so great to hear from you again. 能再次收到你的来信我很开心。
3、Long time no see! 好久不见。
4、I trust that everything is going smoothly for you.
我相信你那里一切都好。
5、It is a great pleasure for me to have this wonderful chance to put pen to paper and send greetings to you.
很高兴我有这样的机会提笔给你写信，寄给你我的问候和祝福。