That's wonderful.

那太好了。

A： Guess what? We got the order.
甲：猜猜看怎么着了？我们得到那份订单了。
B： Thafs wonderful.
乙：那太好了。
Isn't it wonderful?
这太好了，不是吗？
It is terrific to know that you've got promoted.
得知你升职了， 这太好了。
That's great!
这太棒 了 ！
This is so awesome.
这太棒 了。

I'm having too much fun!

我真是太开心了 ！

A: I'm having too much fun!
甲：我真是太开心了 ！
B: You deserve it.
乙：这是你应得的。
I was so happy and so excited after three months of so much stress.
三个月的压力终于摆脱了，我太开心太激动了。
I'm very glad to ...
......我真是太开心。
That made my day.
我好开心。
I've never been this happy.
我从来没这么高兴过。
Nothing would please me more.
没有什么事情让我更开心了。