Based on the clue 'chinas basic currency unit it began as a silver co...', what is the answer?

Based on the clue 'china vetoed this austrians bid for an unprecedent...', what is the answer? What is associated with: china wants portugal to return this colony no later than 1997 the year theyll get hong kong? What is referred to by 'china'? Based on the clue 'chinas 100 yuan banknote shows this guys head in r...', what is the answer? Based on the clue 'chinas dizi is a traditional flute made of this gr...', what is the answer? Based on the clue 'chinas fertile triangle lies between nanjing hangz...', what is the answer? Based on the clue 'chinas grand canal connects these 2 rivers', what is the answer? Based on the clue 'chinas hongshui or indias tapi', what is the answer?