In England nobody1 under the age of eighteen is allowed2 to drink in a public3 bar4.
Mr. Thompson used5 to go to a bar near his house quite often, but he never took6 his son, Tom, because he was7 too young. Then when Tom had8 his eighteenth9 birthday, Mr. Thompson took him to his usual10 bar for the first time. They drank for half an hour, and then Mr. Thompson said11 to his son, "Now, Tom, I want to teach you a useful12 lesson. You must always be careful not to drink too much. And how do you know when you've had enough? Well, I'll tell you. Do you see those two lights at the end of the bar? When they seem13 to have become four, you've had enough and should go home. "
"But, Dad," said Tom, "I can only see one light at the end of the bar. "
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