音乐会被取消了，原因是不可预见的情况。

The concert was cancelled due to ___unforeseen circumstances.

由于不可预见的情况，访问被取消了。

Owing to ___unforeseen circumstances, the visit was cancelled.

许多项目因为不可预见的问题而面临延误。

Many projects face delays because of ___unforeseen problems.