The students were doing an exercise ____ the bell rang. I saw an accident ____ i was waiting at the bus stop. ____ she was writing an email, her computer turned off. He fell down ____ he was climbing a tree. ____ my mom came home, my sister was sleeping. We found same old photographs ____ we were tidying our room. ____ you called me last night, I was studying for the test. I had a bad dream ____ I was sleeping on the sofa. ____ the fire alarm went off, we were listening to music. She started to cry ____ she was watching a movie.

While y When

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