Where are the speakers?

M:   Mom,   may I work at the zoo?
W:   Work? Where?
M: We have a chance to work at the zoo for the whole holiday. All my classmates are going. Can I? Please?
W:   Sounds interesting.
M:   Does that mean you are letting me go?
W:   Yes.   But how about a favor from you  in return when breakfast is over?  Go and practice cleaning cages by starting with that cage you call a bedroom!