Complete these sentence which one suitable preposition

Complete these sentence which one suitable preposition
1. The more difficulties there are, the more we believe...........our government leaders
2.My little brother is very scared....... going out in the dark
3. We should wash the vegetables carefully before cooking because they often have dirt from the farm.....them 4. My mother sets the dinner table......folks,knives and plates
5. Environment pollution can cause serious effect........our health.