51 Directions: For each blank in the following passage, there are four choices given below and marked A, B, C and D. Choose the one that is most suitable and mark your answer by blackening the corresponding letter on the Answer Sheet. Investors can ( )51( ) money simply by loaning it. The money they loan is called capital. Security (担保) is an expensive item which the borrower mortgages (抵押) to the investor to show that he intends to ( )52( ) the debt. The way investors make money on loans is to charge interest. Interest is money that ( )53( ) pay to investors for the use of their money. Interest is usually a certain percentage of the capital. Investors sometimes ( )54 ten percent or more interest per year. The interest may be calculated daily, monthly, or yearly. The interest must be ( )55( ) before the capital can be repaid. If the interest is not ( )56( ) the agreed rate, the interest is added ( )57( ) the capital. Then the borrower has ( )58( ) pay interest on the unpaid interest ( )59( ) on the capital. A debt can grow 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 his money back.