eco.close();
                        reco = undefined;
                        break;
                    case 'pronunciationAssessmentContinuousStream':
                    case 'pronunciationAssessmentContinuous':
                        reco.stopContinuousRecognitionAsync(
                            function () {
                                reco.close();
                                reco = undefined;
                            },
                            function (err) {
                     