【小题1】香港的天气跟北京大不一样。
The weather in Hong Kong ________________________________________ in Beijing.
【小题2】鱼儿睁着眼睛睡觉.
Fish __________________________________________________________________.
【小题3】他既是我最好的朋友又是我的邻居。
He is ____________ my best friend ____________ my neighbour.
【小题4】那些球迷在会场里见到梅西时太兴奋了，他们平静不下来。
The fans were when they saw Messi in the hall
【小题5】自从我十五岁后，就习惯于帮着母亲做家务事。
I my mother with the housework since I was fifteen
解析：
【小题1】is quite different from
【小题2】sleep with their eyes open
【小题3】not only, but also
【小题4】so excited that they couldn’t calm down
【小题5】have been used to helping
试题分析：
小题1:be different from“和……不同”，故答案为is quite different from。
小题2:with表示伴随，with+名词+形容词表示“某物某种状态”。故答案为sleep with their eyes open。
小题3:not only…but also“不但……而且……”。
小题4:so…that+从句“如此……以至于……”，calm down“平静下
来”。故答案为so excited that they couldn’t calm down。
小题5:be used to doing sth“习惯于做某事”，故答案为so excited that they couldn’t calm down。