用词汇框中的单词或词组填空。 trade exchange item official inflation it wasn't until... B.C. rate thanks to currency the rest (1) China has a lot of________with foreign countries. (2) In the old days many things like salt, shells, and cloth were used to________for other items. (3) The Chinese began to build the Great Wall in the 5th Century ________. (4) A: How would you like your money? B: Five hundreds, please, and fifties for ________. (5) It was the Chinese who first used paper money as an official ________ across the country. (6) In the country prices went up because of ________. (7) The United Kingdom of Great Britain and Northern Ireland is the ________ name of Britain . (8) We found an important news ________ in today's China Daily. (9) I'd like to exchange some money. What's the ________ today? (10) ________ the good weather, we had a wonderful harvest this year. (11) ________about 700 years later that paper money was used again in China .