He ____________ medicine in Paris in the 1990s., studied, had studied, would study, They ___________ the experiment before the professor arrived., were finishing, had finished, finished, The doctor was exhausted because he __________ an all-nighter., was pulling, had been pulling, pulled, The lights went out while the nurses _____________ the patients for surgery., were preparing, prepared, had been preparing, Researchers __________ new vaccines, but some diseases remain incurable., had been developing, were developed, have developed, My grandmother __________ me stories about how people feared tuberculosis., used to tell, would tell, both a and b, When we were kids, we __________ outside until dark almost every evening., used to play, would play, both a and b, People ___________ that fresh mountain air could cure TB., used to believe, would believe, both a and b.

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