How to correct these sentence

[Lady Liberty]

1. By reading everyday it will help students become better writers.
2.The reason I failed this test is because I had no time to study.
3.Believing in fairytale endings, many marriages end up in divorce.
4.All over the world, American's are known for their wasteful ways.
5.My car gives better gas mileage than my sister.

[bhaisahab]

1. By reading everyday it will help students become better writers.
2.The reason I failed this test is because I had no time to study.
3.Believing in fairytale endings, many marriages end up in divorce.
4.All over the world, American's are known for their wasteful ways.
5.My car gives better gas mileage than my sister.

You try first.