The Chinese abacus(算盘), officially ______ as a cultural heritage at the 8th Annual UNESCO World Heritage Congress, is another symbol of Chinese wisdom.
Yesterday we visited a modern hospital, around _______ some fruit shops.
He had thousands of students, many of ______ gained great success in their own field.
He asked a lot of questions, none of ______ was easy to answer.
He asked a lot of questions, and none of ______ was easy to answer.
He told me that he had two girl-friends, neither of _______ knew anything about the other.