1When I'(come)....... into the room, two boys(play)..........football
2Peter (turn on) ............. the tv, but nothing (happen).........
3While we (run) ........in th park. Mary(fall over)
4While I (listen ) ............. to music. I (hear) ............... the doorbell
5I(break)...... my pen While I (do).............. my homework
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Sinh Học lớp 12
