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"CDC guidelines are still recommended but not required, and the president is the most tested man in America," she said, referring to the Centers for Disease Control and Prevention. "It's his decision whether to wear a mask."

"Canada is a country made strong not in spite of our differences but because of them," Trudeau told the gathering. "We don't aspire to be a melting pot－indeed, we know true strength and resilience flows through Canadian diversity."

"Caution must prevail," said David Menlow, president of IPO Financial Network. "Anyone buying this stock should not think about putting it away for retirement."

"Challenges ahead include ensuring effective implementation across all stages from planning to completion, and improving awareness of the guide among those involved in offering such services," said Zhang Lijun, an official of the city's housing and urban-rural development bureau.

"China is a major factor in the international economy; no one can really imagine international growth that is sustained without Chinese economic growth," said Rice, who also has served as US national security advisor.