Completing a circuit causes electricity to flow through that circuit.
Electricity flows through an electric motor in a fan, causing the fan's blades to turn.
Completing a circuit causes the fan's blades to turn.
Completing a circuit causes fan's blades to what?

(a) break
(b) cycles
(c) disappear
(d) bend
(e) behave
(f) Rise
(g) energy
(h) turn