题目内容：
__________根据以下内容，回答下面的题目。Investors can _51_ money simply by loaningit．The money they loan is called capital．Security (担保) is anexpensive item which the borrower mortgages (抵押) to the investorto show that he intends to _52_ the debt．The way investorsmake money on loans is to charge interest．Interest is moneythat _53_ pay to investors for the use of their money．Interest isusually a certain percentage of the capital．Investors sometimes_54 ten percent or more interest per year．The interest may becalculated daily, monthly, or yearly．The interest must be_55_ before the capital can be repaiD．If the interest isnot _56_ the agreed rate, the interest is added _57_ the capital．Then theborrower has _58_ pay interest on the unpaid interest _59_ on the capital．A debt cangrow quickly this way．If the total of the capital and accumulated interest gets too high,the investor will take _60_ of the item used as security and sell it to get hismoney back．__________A．paid
B．to be paid
C．pay
D．paying
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