Past Perfect. 9 form

Some students__________ (already/finish) their homework before the teacher even assigned it.

By the time I got to the party, everyone __________ (leave).

She was exhausted because she __________ (work) for 12 hours long.

Before I moved to this city, I __________ (never/be) on a subway.

He realized he had lost his wallet after he __________ (leave) the restaurant.

When I arrived at the airport, my flight __________ (already/depart).

They couldn't find their keys because they __________ (misplace) them.

By the time the ambulance arrived, the injured man __________ (lose) a lot of blood.

I was so surprised when I saw him because I __________ (not/see) him in years.

Before she met her husband, she __________ (never/travel) outside of her home country.