Di buon umore. Bello biondo ragazzo appoggiato sul tavolo mentre guarda dritto alla fotocamera - Foto e immagini stock

New ideas. Cheerful teenage students sitting in the classroom and discussing alternative energy sources while one of the girl pointing at wind turbines

Alternative energy. Ginger girl pointing on wind turbines attracting attention of her interested classmates

High angle view of schoolchildren writing off homework of their classmate during break

Back view of bullied schoolgirl sitting near schoolkid with smartphone and cruel classmates, cyberbullying concept

Enjoying team work. Happy good-looking children and teacher enjoying their team work all together

Before the test. Attentive teacher giving her serious pupil a sheet of paper with the test assignment.

Repeating the task. Smiling teacher slowly explaining meaning of the new exercise to one of the pupils.

Group photograph. Cheerful elementary school class standing around their teacher raising their hands.

Learning mood. Little dark-haired boy smiling sitting at his desk in the back of the classroom.