这不是我的错，是你忘记锁门了。

It's not my ___fault, you forgot to lock the door.

这台机器因为一个电路故障而停止了工作。

The machine stopped working due to a ___fault in the circuit.

科学家们正在研究这条地震断层的地质活动。

Scientists are studying the geological activity along this ___fault line.

她的发球被判为失误，因此需要重发。

Her serve was called a ___fault, so she had to try again.