他的信用卡债务在过去两年里不断累积。

His credit card debt has ___accumulated over the past two years.

他多年来积累了大量专业知识。

He has ___accumulated extensive professional knowledge over the years.

他的退休金在过去五年里已经累积了不少利息。

His retirement fund has ___accumulated a lot of interest over the past five years.