How do we respond when trials occur in our life? What is the best respond when life isn't fair

I beleive a person should repond happy in their trials. I think that a person does have every right to be angry why is this trials is occur. We have every right to answer those questions. I think the best response in our trial is to practice to be happy when trials occur and it's hard. I want to hear more of your imput so that I can put more