Underline the mistake and rewrite the correct one

Underline the mistake and rewrite the correct one.
1.    The more complicated the puzzle gets, the long it takes to solve
...............................................................................................................................................
2.    The most polluted the air gets, the harder it is to breathe.
...............................................................................................................................................
3.    Despite the crowded streets, Tom decided to get up downtown by motorbike.
...............................................................................................................................................
4.    We had to cancel our trip because our dad came up with the flu.
...............................................................................................................................................
5.    The cleaner the kitchen is, more inviting it looks.
...............................................................................................................................................
6.    The crowdeder the bus is, the longer the journey takes.
...............................................................................................................................................