The Chinese abacus(算盘), officially ______ as a cultural heritage at the 8th Annual UNESCO World Heritage Congress, is another symbol of Chinese wisdom.
She brought in her three friends, none of __________ I had ever met before.
Ellen was a painter of birds and of nature,__________,for some reason, had withdrawn from all human society.
The prize will go to the writer __________ story shows the most imagination.
The road conditions there turned out to be very good,__________ was more than we could expect.
John invited about 40 people to his wedding, some of __________ are family members.