While the students were studying in the library, they suddenly ______________ a loud noise outside., heard, were hearing, My mother ______________ dinner when the telephone rang., was cooking, were cooking, We ______________ to the beach last Sunday because it was raining., didn't go, didn't went, When the teacher entered the classroom, the students ______________ on their science projects., were working, were worked, While my brother ______________ his bicycle, he found a small kitten in the garden., repaired, was repairing, The children were playing soccer when it suddenly ______________ to rain., started, was start, I ______________ television when my parents arrived home, so I didn't hear the doorbell., was watched, was watching, While the astronauts were preparing for their mission, one of the computers suddenly ______________ working., stopped, stoped, My sister ______________ her homework yesterday because she was feeling sick., didn't did, didn't do, While the scientist ______________ an experiment, the laboratory lights suddenly went out., was conducted, was conducting, The students were walking to school when they ______________ a strange object in the sky., saw, were sawing, My parents ______________ a movie when the electricity suddenly went out., were watching, were watched, We ______________ the science museum last weekend because it was closed., didn't visited, didn't visit, While the astronauts ______________ through space, they received an important message from Earth., were travelled, were traveling, The children were sleeping when their dog suddenly ______________ loudly., barked, was barking, My father ______________ his car when he accidentally dropped his phone., was driving, drove, The students ______________ attention when the teacher explained the new grammar topic, so they made several mistakes., weren't paying, wasn't paying, While Emma was walking through the park, she suddenly ______________ an old friend from elementary school., met, was meeting, My brother ______________ his favorite video game when his computer suddenly stopped working., were playing, was playing, The scientists ______________ a new planet during their research last year., were discovered, discovered

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