请在这个方框里签上你的名字。

Please put your ___signature in this box.

我本以为是个玩笑，但当我看到签名时，我知道这是真的了。

I thought it was a joke but when I saw the ___signature I knew it was for real.

合同需要你的签名才能生效。

The contract requires your ___signature to be valid.