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British Prime Minister Boris Johnson leaves 10 Downing Street for the Prime Minister's Questions at the House of Commons in London, Britain, on May 26, 2021. Earlier Wednesday, Dominic Cummings, former top adviser of the British prime minister, said that thousands of people died unnecessarily because of the British government's failings and Boris Johnson was "unfit for the job" of the prime minister in tackling COVID-19, Sky News reported. (Photo by Ray Tang/Xinhua)