puits (1) enseignement (1) enquête (1) recherche (1) papier (1) information (1) éducation (1) taux (1) Education (1) Development (1) Language (1) Specimens (1) Volunteers (1) Theater (1) Teaching--Aids and devices (1) Teaching (1) Teachers (1) Stairs (1) Speeches, addresses, etc (1) Science (1) Research (1) Percentage (1) Paper (1) Materials (1) Lectures and lecturing (1) Learning (1) Language teachers (1) Gifts (1) Experience (1) Examinations (1)