Hi everyone! I'm writing a research in english and I'm wondering if the formulation of my titles are correct. Is it right to begin each chapter title with A, An, One or should I turn the sentence differently? Ex : 1. One site in an evolving area 2. A challenging social and economic context 3. One site in the centre of a metropolitan transport network 4. A cultural heritage to consider 5. A diversity of urban forms 6. An uncompleted green belt Thanks a lot!