【题目】After the power failed, she had to deliver the baby in the darkness.
After the power was , she had to deliver the baby in the darkness.

【答案】cut；off
【解析】句意：停电之后，她必须在黑暗中生下这个婴儿。cut off固定短语，”隔离，切断”，与fail同意，因此答案为cut，off。