当实验失败后，溶液又变回了原来的颜色。

After the experiment failed, the solution ___returned to its original color.

无论我们怎么谈其他话题，他总是会回到昨天的足球比赛上。

No matter what we discuss, he always ___reverts to yesterday's football match.

如果租约到期后没有续签，房产将自动归还给原业主。

If the lease is not renewed after expiration, the property automatically ___reverts to the original owner.