Money is of very great use as a means of exchanging goods and services. If, for example, I

am a tailor, it will net be【C1】______convenient for me always to have to exchange the clothes I make for other goods or services. A doctor may went to buy a coat from me, but I may not need medical【C2】______so he will then have to find【C3】______else that I want, or look for another tailor who needs him.【C4】______money, the tax-collector would come back to his office with au extraordinary collection of【C5】______.

Considered as a【C6】______of storing up buying power, money has good and bad points. It can more【C7】______be kept a long time【C8】______such things as food, which rots, or buildings, which slowly【C9】______to pieces, or machines, which rust. It takes up very little【C10】______, and if you put it in a bank, it is as【C11】______as anything in this world can be.

But modern money has some very【C12】______disadvantages as a means of storing up buying【C13】______. In the old days, when money was in the【C14】______of geld and silver coins, the metal in each was really【C15】______the amount stamped on the coin. But the paper in modem paper money and even the metal in most modem coins are worth less than the【C16】______written on them.【C17】______, the buying power of modem money can change very greatly【C18】______a short time.

It has happened more than once this century that the buying power of a country's money has fallen to almost【C19】______in a few weeks,【C20】______many thousands of people with savings.

【C1】

A．in mm

B．by chance

C．at all

D．on average