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She __________ (watch) TV when the power went out.
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They __________ (study) for hours before they finally took a break.
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I __________ (walk) in the park when I saw a rare bird.
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We __________ (not/sleep) well last night because of the storm.
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He __________ (work) in the garden all day when he suddenly felt sick.
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They __________ (play) video games for hours before their parents came home.
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Before the concert started, the band __________ (practice) backstage for several weeks.
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She __________ (cook) dinner when her friend called.
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I __________ (drive) to work when I realized I left my phone at home.
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The children __________ (make) a lot of noise when the guests arrived.
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They __________ (not/attend) the meeting because they __________ (work) on an important project.
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By the time the movie began, we __________ (wait) in line for over an hour.
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She __________ (read) the book for a few days when she decided to watch the movie instead.
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The team __________ (train) for the competition since January when it was suddenly canceled.
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I __________ (think) about changing my job for months when a great opportunity appeared.
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They __________ (build) the house for a year when they had to stop due to funding issues.
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Before they moved in, the new homeowners __________ (paint) the walls for weeks.
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The students __________ (not/study) much before the exams started, which was why they were so nervous.
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He __________ (try) to fix the car himself for hours when he decided to call a mechanic.
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We __________ (plan) our vacation for several months when we had to cancel it.
Answers for Self-Checking:
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was watching (Past Continuous)
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had been studying (Past Perfect Continuous)
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was walking (Past Continuous)
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weren't sleeping (Past Continuous)
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had been working (Past Perfect Continuous)
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had been playing (Past Perfect Continuous)
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had been practicing (Past Perfect Continuous)
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was cooking (Past Continuous)
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was driving (Past Continuous)
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were making (Past Continuous)
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weren't attending ... were working (Past Continuous)
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had been waiting (Past Perfect Continuous)
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had been reading (Past Perfect Continuous)
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had been training (Past Perfect Continuous)
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had been thinking (Past Perfect Continuous)
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had been building (Past Perfect Continuous)
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had been painting (Past Perfect Continuous)
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hadn't been studying (Past Continuous)
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had been trying (Past Perfect Continuous)
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had been planning (Past Perfect Continuous)