Помогите пожалуйста переведите и выберите правильный ответ и почему его мы…

Помогите пожалуйста переведите и выберите правильный ответ и почему его мы выбрали имено этот вариант Вотзадание Open The brackets and complete the sentences using past simple , past continuous or past perfect. 1. Our teacher explained to us that Americans (wrote/ had written) their Constitution 200 years before and it (worked/ was working) still. 2. I was not sure that in the USA the judges (worked / had worked) in the Supreme Court as long as they (lived / were living). 3. When my brother (came / was coming) , I just (finished / had finished) reading the documents. 4 . William (sighed / had sighed) all the papers by 6 o'clock. 5. The conference (began / had begun). Before James (arrived/ had arrived).