By the time the teacher arrived, the students ______ for 20 minutes., talked, have been talking, had been talking, were talking, She was very confident because she ______ the topic many times before., studied, had been studying, studies, had studied, The floor was completely wet because someone ______ water everywhere., had spilled, spilled, have been spilling, spills, His eyes were red because he ______ in front of the screen for hours., had sat, has sat, had been sitting, sits, They ______ for over an hour before the bus finally arrived., waited, had been waiting, have waited, were waiting, She didn’t recognize him because he ______ a lot since the last time they met., changed, changes, have changed, had changed, I was surprised because I ______ that movie before., saw, was seeing, had seen, see, The kids were very dirty because they ______ outside in the mud., had been playing, played, were playing, have been playing, When I got home, my parents ______ dinner, so the food was ready., cooked, cook, had cooked, have cooked, He was out of breath because he ______ up the hill., ran, runs, was running, had been running, When the police arrived, the thief ______, so they couldn’t catch him., escaped, had escaped, had been escaping, has escaped, She was very frustrated because she ______ to fix her computer for hours, but it still didn’t work., tries, tried, had been trying, had tried

had_had been

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