It's nice to see you on new year's day.
很高兴在新年之际看到大家。
Nice to see you after a long time.
很高兴看到你后，很长一段时间。
Good morning, nice to see you again, too.
早上好，又见到你了真高兴。
Nice to see you getting some use out of that thing.
真高兴你能用那东西帮我忙。
So nice to see you, what are you doing here?
见到你很高兴啊，你在这儿干嘛呢？