all of the above, because if you volunteered to read the passage to the class, then you would still need to do the work. And if you are listening you have to listen for those main ideas and such, and speaking is pretty much the same as reading.
Where´s the poem? so I can try to help
The past tense of cost is usually “cost”.
Very rarely is the past tense “costed” used, it’s more common to just say cost.
