Female teacher walking in classroom and talking to immigrant students as they taking test during lesson in language school
Teacher distributing papers to students in a classroom before an exam
Teacher pouring chemical into test tube with his student in classroom .
Teacher pouring chemical into test tube with his student in classroom .
Teacher pouring chemical into test tube with his student in classroom .
Teacher pouring chemical into test tube with his student in classroom .
School teacher and a group of elementary students working with a laptop and then taking a selfie together. Teacher with pupils watching laptop at indoors, slow motion