You're joking, right?

你在開玩笑吧？

You've got to be joking./You're kidding.

你肯定是在開玩笑吧

I was completely surprised.

我真是大吃一驚

The news came out of nowhere.

這條新聞完全是無中生有

What a surprise.

真是意想不到

What a shock.

真是令人震驚

I can't believe it.

我不相信

That's incredible.

真是令人難以置信

Dialogue1:

A: I've got some good news to share with you. I just found out that I'm getting that promotion that I've always wanted.

我有個好消息要告訴你。我剛剛知道，我終于要如愿以償獲得晉升了。

B: Really? That's wonderful.

真的嗎？這可是太好了。

Dialogue2:

A: I was completely surprised when she said she wanted a divorce.

當她說她要離婚的時候，我感到很驚訝。

B: You must have been in shock. Let me know if there is anything I can do for you.

你肯定是嚇蒙了，要是有什么我能幫上忙的話，一定要告訴我。