Answer:
The fee was asked for by me.
Explanation:
Shall I ask them for my fee?
This sentence is in Active Voice which is:
Subject + Verb + Object
Passive Voice is:
Object + Verb + Subject
So..
The subject is I
The verb is asking
The object is the fee
So you end up with
Active: Shall I ask them for my fee?
Passive: The fee was asked for by me.
