他们中许多人死于霍乱。

Many of them ___succumbed to cholera.

他会不会是死于肺炎？

Could he have ___succumbed to pneumonia?

尽管接受了最好的医疗护理，这位病人最终还是死于手术并发症。

Despite the best medical care, the patient eventually ___succumbed to the complications from the surgery.