Open the brackets and complete the sentences using past simple…

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 (signed/had signed) all the papers by 6 o'clock, 5. The Conference (began/had begun) before James (arrived/had arrived).