你能解释一下你上周五为什么缺席吗？

___Can ___you ___account ___for your absence last Friday?

他最近生病了，这就是他在比赛中表现不佳的原因。

His recent illness ___accounts ___for his poor performance in the match.

很难解释她态度突然转变的原因。

Trying to ___account ___for her sudden change in attitude was difficult.