1. 看看下列句子中哪一处划线部分有错误，请把它圈出来，并在后面的横线上更正。

①Mary is much friendliest person in the class.                 

②Which city is largest, Beijing or Guangzhou?                 

③ Jack is naughty. Mike is very naughtier than Jack.             

④London is the bigger city in Britain.                        

⑤ June is hot. But August is much hot than June.