完形填空

　　This was one of my experiences 　　1　　．When I was in my 30s, I was working for a large international company which had its head office in London．I was working in the 　　2　　 department．

　　The company had a training centre which was just outside London．Different courses were held there throughout 　　3　　 and I 　　4　　 go on one training course a year．These usually started 　　5　　 a Sunday evening and lasted six days．

　　Once I was 　　6　　 a week's training course with about forty 　　7　　 sales people．I was in the bar on the Friday evening and suddenly a woman who was 　　8　　 behind the bar asked me a curious question．“I hope you don't 　　9　　 my asking, ”she said, “but I've been 　　10　　 about it all week．Have you got a sister 　　11　　 Mary?”The woman's name was Jane, and she used to do various jobs at the training centre．She worked in the office; she organized all the food and drink for the centre and she worked in the bar at lunch time and in the evening．My answer 　　12　　 Jane's question was

　　“Yes”, and Jane said, “I thought 　　13　　．I met her last September when she was organizing a course here．”At that time, my sister was working for 　　14　　 company but in a different part of the country．That was 　　15　　 she came to be at the training centre．

　　　　16　　 surprised me was how Jane guessed we were brother and sister．Three things made it even more 　　17　　．First, she had met my sister six months before she met me．Second, they have about sixty new people every week at the training centre．So about one thousand five hundred people had 　　18　　 the centre in those six months．And 　　19　　, my sister is married, so she doesn't have the same family name as me．

　　We're not 　　20　　, but I guess we must look quite like each other．

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