我以为这只是练习，但显然是真的。

I thought it was just a practice, but apparently it was ___for ___real.

我以为是个玩笑，但当我看到签名时，我知道这是真的。

I thought it was a joke, but when I saw the signature, I knew it was ___for ___real.

威胁是认真的，所以我们不得不立即采取行动。

The threat was ___for ___real, so we had to take immediate action.