Find a grammar mistake in each sentence and correct it.

1. The dirtier the air gets, more difficult it is for people to breathe.

2. My brother likes to get up the city by bike, but I prefer using public transport

3. Nearer the school is, the more convenient it is for the students.

4. She came up with a cold after walking in the heavy rain.

5. The more slow the Internet is, the angrier the users get.