题目内容：
提示：暑假第一天，玛丽遇到彼得。玛丽告诉他，自己已经在一家商店找到一份工作，并说明了这样做的原因。得知彼得的假期计划后，玛丽预祝他假期愉快。 Mary:Hi,Peter! Going away for the holidays,right?
Peter: Yes, I am. 51 ?
Mary:Well, I'm going to stay in the city.
Peter:what are you going to do then?
Mary: 52 .
Peter: 53 ?
Mary : No, never in a store, but I can learn.
Peter: 54 ?
Mary:I need money for school next term,and I can get some experience. So, 55 again?
Peter:Yes,I've gone camping four times. It's wonderful at a summer camp.
Mary: Well, Peter, enjoy your holidays !
Peter: You too. See you !
根据以上内容,回答题
第51题应填入_____
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答案解析：