BEIJING, June 2, 2020 (Xinhua) -- Students have a class at Tsinghua University High School in Beijing, capital of China, June 1, 2020. Students at their first and second grades of senior high schools, first and second grades of junior high schools and sixth grade of primary schools returned to school for this semester in Beijing on Monday.

BUCHAREST, June 2, 2020 (Xinhua) -- A man and a girl walk past reopened terraces of restaurants in Bucharest, Romania, on June 1, 2020. Romania adopted new relaxation measures from June 1, including reopening open-air terraces of restaurants and beaches, lifting the travel restrictions for residents, as well as allowing outdoor shows and sports events.

CHICAGO, June 2, 2020 (Xinhua) -- Demonstrators protest over the death of George Floyd in Chicago, the United States, on May 30, 2020. Chicago Mayor Lori Lightfoot imposed a curfew on the city on May 30. Chicagos precautions followed a chaotic and violent Saturday evening, when many businesses along the streets were looted, police cars overturned and some properties damaged.

AURORA (U.S.), June 2 , 2020 (Xinhua) -- Demonstrators gather at Aurora City Hall during a protest over the death of George Floyd in Aurora, an outer suburb of Chicago, the United States, on May 31, 2020. Chicago Mayor Lori Lightfoot on Sunday once again set strict parameters for the city effort to contain another night of protesting. Chicagos precautions followed a chaotic and violent Saturday evening, when many businesses along the streets were looted, police cars overturned and some properties damaged.

TORONTO, June 2 , 2020 (Xinhua) -- A security guard (R) wearing a face mask keeps people outside Terminal 1 of Toronto Pearson International Airport in Toronto, Canada, on June 1, 2020. Toronto Pearson International Airport implemented new health and safety measures such as mandatory face coverings and the barring of meeters and greeters from inside its terminals to help reduce the spread of COVID-19 on Monday.