Banking staff __(be) to be given more training to help them deal with armed robbers.

Banking staff __(be) to be given more training to help them deal with armed robbers.

which and why ? thanks you~

我不明白的是 动作的执行者没有指出来，怎么判断单复数呢？？
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wholesale banking和retail banking分别是什么阿？ banking facilities available?何意 figures of banking facilities是什么意思？ 英语“STAFF”是什么意思？ a full-time staff? staff是不是可数名词？ staff有没有复数? staff-room是什么意思？ staff hour是什么意思？ 足球中的staff是什么意思？