1.It is hotter in Wuhan than in Shanghai summer. 武汉的夏天比上海要热.此句是对两地的天气进行比较,而不是用武汉的天气同上海这座城市进行比较.因此,Shanghai前面应该有介词 in,故应改为：It is hotter in Wuhan than in Shanghai in summer.
2.形容词和副词最高级交代比较范围时要注意恰当使用介词.表示“类的范围”用介词“of”；表示“整体的范围”用介词“in”.
China is the largest country of Asia.中国是亚洲最大的国家.应改为：China is the largest country in Asia.
3.In all the boys he did his homework most quickly.在所有的男孩子中,他完成家庭作业最快.应改为：Of all the boys he did his homework most quickly.
你第一题题目打错了……是summer…….给点分吧……看在我这么认真作答的“面子”上……