A teacher helps a pupil to sanitize his hands at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday. (Photos by Serge Haouzi/Xinhua)

Pupils arrive at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

Pupils arrive at a classroom in a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

Pupils attend a class at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

Pupils arrive at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday. (Photo by Serge Haouzi/Xinhua)

Children are on their way to school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

Pupils arrive at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

A pupil raises her hand during a class at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

Pupils arrive at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

Children are on their way to school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

Pupils arrive at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.

Pupils attend a class at a school in Antibes, southern France, on April 26, 2021. France's nurseries and primary schools reopened from Monday.