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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______有产生呼吸节律的基本中枢。