Past Perfect VS Past Perfect Progressive

When they arrived at the police station, he said that he _____ anything wrong.

When he retired he _____ in the company for more than 50 years.

I looked at him and I knew he _____ in a fight, because he had a black eye.

I was very late. When I arrived, the conference _____.

Mike________his friends before he went abroad for two months

Paul_______ his car for two days before he called the mechanic.

Pamela_______ for two hours before her boyfriend arrived.

Melany_____her house by the time the guests arrived. 

My brother_______before I felt angry with him.

The sales manager________the advantages of his product for about half an hour before I agreed to buy some samples.

I_______before my alarm clock rang.