Составьте условные предложения со словами lead to, to prevent conflicts, resolve,

1 Building of big plants and factories leads to pollution of the environment.
2 Great politics and heads of the countries try to prevent conflicts.
3 They recommend to resolve problems far beforehand.
4 Sally doesn't like to listen to her parents as she does not use to obey.
5 First of all you should respect your friends if you want to have a real friend.