弗兰克在最后一刻退出了，所以我们多了一张票。

Frank ___backed ___out at the last minute, so we had a spare ticket.

我第二天见到了她，试图找借口退出交易，但她没有让我退出。

I met her the next day and tried to make an excuse to ___back ___out of the deal, but she didn't let me.

经过深思熟虑，她由于个人原因决定退出这个项目。

After much consideration, she decided to ___back ___out of the project due to personal reasons.