Every human being has a unique arrangement of the skin on his fingers and this arrangement is unchangeable. Scientists and experts have proved the 1of finger-prints and discovered that no 2similar pattern is passed on from parents to children,though nobody knows why this is the case. The ridge 3on a person' s fingers does not change with growth and is not affected by surface injuries. Burns, cuts and other damage to the outer part of the skin will be replaced in time by new one which bears a reproduction of the 4pattern. It is only when the inner skin is injured that the arrangement will be 5. Some criminals make use of this fact to 6their own finger-prints but this is a dangerous and rare step to 7. Finger-prints can be made very easily with printer's ink. They can be recorded easily. With special methods, 8can be achieved successfully within a short time. Because of the simplicity and economy of this system, finger-prints have often been used as a method of solving criminal case. A 9man may deny a charge but this may be in vain. His finger-prints can prove who he is even if his 10has been changed by age or accident.A)take B)uniqueness C)harmed D)identificationE)structure F)naturally G)exactly H)positionI)appearance J)original K)destroyed L)diminishM)doubtful N)remove O)suspected