pen pal stamps likes my collecting .

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【答案】My pen pal likes collecting stamps.

【解析】

pen pal笔友；stamps邮票；likes喜欢；my我的；collecting收集；根据所给的句号，可知句子是一个陈述句，根据所给词义可以连成句子：我的笔友喜欢收集邮票。故答案为My pen pal likes collecting stamps.