15.
A。learn slowly意为“慢慢学”，也就是说不要急于求成，应循序渐进。
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There
was once a millionaire who loved money than anything else in the world. He
didn’t know exactly how much he had, so he took on a little girl to __1__
all his money for him.
It
__2__ the little girl six days to count all the money. When she told the
millionaire that he had forty-two __3__ dollars, he was __4__
with joy and asked, “ How much __5__ do you want?” He thought that __6__
she was only a child, he could __7__ her into taking a very small amount
of money.
The
girl said, “well, I worked for six days, so I think you __8__ pay me for
six days. Give me two pennies for the first day. Each day after that, just give
me the amount you give me the day before, multiplied by itself.
The
__9__ thought that in this __10__ he would only have to give her
a __11__ dollars. What a __12__ little girl! So immediately, he __13__
his lawyer sign up the contract, fearing that she would change her __14__
.
On the
first day the millionaire paid her two pennies, and on the second day, two
pennies times two pennies, or four pennies.
Each
day after that, he gave her __15__ number of pennies he had given her
the day before, multiplied by itself. And by the sixth day, the foolish
millionaire had to give the clever little girl all his money.