Past Simple vs Past Perfect

They ......... (live) in Paris for 10 years before they ............... (move) home.

As soon as I ________ (download) the document, I knew I _____(make) a mistake.

Mary _______ (ring) John’s doorbell at 8:15 yesterday but John _______ (already/ leave) the house.

By the time the firemen _______ (arrive), the fire _____ (destroy) three houses.

Our economy __________ (not stand) a chance of developing before the government _______ (adopt) the open-door policy.

When I last ______ (speak) to her, she still ______ (not finish) her assignment.

Nobody ________ (come) to the meeting because Angela ________ (forget) to tell them about it.

She _____ (go) to Disneyland three times before her family ______ (move) to another state.

After I ______ (complete) the form yesterday, I ______ (give) it to the secretary.

Sarah ______ (drive) three hundred miles by the time she ________ (arrive) in Tacoma.