According to Xi, common values held by Chinese people of all ethnic groups are ________ for the country's future and its people's well-being.
My English teacher’s humor was ____ make every student burst into laughter.
---Turn off the TV, Jack, ______ your homework now?--- Mum, just ten more minutes, please.
She kept a little notebook, in which the telephone numbers and email addresses of her friends.
Lawrence Craven, a doctor from the USA, is the author of several published reports, one of ________ introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks.
It was thirty years _______ he was invited as an outstanding alumnus to celebrate the 128th anniversary of the university.