1 There was _a_ knock on _the_ door. I opened it and found _a_ small dark man in _a_blue overcoat and _a_ wool cap.
2 He said he was _an_ employee of _the_ gas company and had come to read _the_ meter.
3 But I had _a_ suspicion that he wasn't telling _the_ truth because _the_ meter readers usually wear _a_ peaked cap.
