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Some boys join the Navy when they are young．They are then given a 1 of training as sailors．It is a long course, both on land and at sea．During it, the boys study things 2 mathematics and science, learning to tie the knots(打結(jié)), fire guns and to 3 other practical things．
One of the important things they are taught is, of course, how to swim．In the old days, many sailors were unable to swim．
At one school for sailors, the swimming instructor was very good．He had 4 had a boy whom he had failed to teach to swim by the time the course was 5 ．One year, however, there was one 6 boy on the training course who seemed quite unable to learn to 7 ．The instructor tried giving him extra lessons, but he had no 8 at all, whatever he did．In the end, 9 the time drew near for the 10 to end, he had to admit failure．
One day, he called the boy to him after the swimming lesson and said to him,“John, I have tried very hard to teach you to swim, but I have failed for the first time in my life．Now I want to give you a(n) 11 ．Listen carefully．”
“Yes, sir,”answered the boy．“Well,”the instructor 12 ,“if you are ever in a ship and it 13 , just jump over the side into the sea, go right down to the bottom and 14 to the shore as fast as you can．That is the only 15 you will save your life．”
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