Enhancing Engineering Students' English-Speaking Skills via Role-plays through Google Gemini 2.5 Flash in Practice and CEFR in Assessment in a Blended Learning Modality. - Manipatruni, Venkata Ramana; Rajeswari, T. S.; Kumar, Nannapaneni Siva; Karim, Mohammad Rezaul; Chundru, Tanuja (Arab World English Journal, 2026)