Scientists ______ the brain when the power went out., were studying, studied, have studied, study, The mathematicians ______ a new theory while the professor was speaking., discussed, were discussing, have discussed, discuss, Philosophers ______ about free will all evening., have argued, argued, were arguing, are arguing, The researcher ______ the instrument when it suddenly broke., used, was using, uses, has used, They ______ pollution levels when the rain started., have measured, measure, were measuring, measured, The team ______ an experiment at 9:00 a.m. yesterday., conducted, conducts, has conducted, was conducting, Rockets ______ into space while people watched from Earth., launch, were launching, launched, have launched, The pilot ______ the plane when the passengers heard a loud noise., lands, was landing, landed, has landed, The crew ______ the plane when the passengers arrived., refueled, have refueled, were refueling, refuel, The detective ______ the suspects during the investigation., interviewed, was interviewing, interviews, has interviewed, The robbers ______ from the bank when the police arrived., ran, run, were running, have run, The witness ______ the sequence of events to the detective., retells, has retold, was retelling, retold, The race car ______ into the pit stop when the brakes failed., entered, was entering, enters, has entered, The mechanic ______ the brakes while the driver waited., has checked, checked, was checking, checks, The surfer ______ toward the beach when he hit his head., swam, swims, has swum, was swimming, The language learner ______ the target language when the class ended., practiced, was practicing, practices, has practiced, She ______ her fluency by speaking every day., has improved, was improving, improved, improves, Scientists ______ evidence while the assistant was writing notes., collected, collect, have collected, were collecting, They ______ ways to save energy when the meeting began., were discussing, discussed, discuss, have discussed, According to the report, global warming ______ many environments rapidly., has affected, affected, was affecting, affects.

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