I. WRITE THE CORRECT TENSE, PAST PERFECT or PAST PERFECT PROGRESSIVE.
 (18 pts)
 1. They ________________ for hours by then. (hike)
 2. ________ Linda ever (fly) __________ before her flight last week?
 3. The waiter served something that we (not / order)__________________ 
 4. How long ______ you __________________ the flat before you said it ( own).
 5. My shoes were dirty because I _____________________ in the garden (work). 
 6. She ________________ to drive for six years but she still failed her driving test (learn).
 7. I ____________________ for two hours so I took a break (study).
 8. She ____________ around the world since 2013. (travel)
 9. _____________ the same car for ten years? (he, drive)