根据下例各个句子的要求，完成、改写或翻译句子。
小题1:I can’t help ________ _________ (亲他) __________ __________ (每当) I see my son.
小题2:All the afternoon, I worked in the lab _________ ________ _________ __________(窗户开着).
小题3:The problem ___________ _________ __________ ____________ (在会议上谈论的) yesterday was very difficult to solve.
小题4:In modern society cell phones __________ __________ ___________ _________ __________ ___________ (取代了信件) in communication.
小题5:He will never forget his first time to take a train. (改为倒装句)
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小题6:从山顶上看，这个城市看起来像一个大花园。 (用过去分词短语做状语)
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